Medium
Security advisory
An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-9938
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:34 UTC · Revision 1
Source evidence
An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.
osv:CVE-2016-9938
Complete source record
{
"id": "fcb3ed8fff1aab85a03152b0ef9ec1e1fb69683ff1b9bb2dce2725db7039ba31",
"url": "https://osv.dev/vulnerability/CVE-2016-9938",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-9938",
"summary": "An issue was discovered in Asterisk Open Source 11.x before 11.25.1, 13.x before 13.13.1, and 14.x before 14.2.1 and Certified Asterisk 11.x before 11.6-cert16 and 13.x before 13.8-cert4. The chan_sip channel driver has a liberal definition for whitespace when attempting to strip the content between a SIP header name and a colon character. Rather than following RFC 3261 and stripping only spaces and horizontal tabs, Asterisk treats any non-printable ASCII character as if it were whitespace. This means that headers such as Contact\\x01: will be seen as a valid Contact header. This mostly does not pose a problem until Asterisk is placed in tandem with an authenticating SIP proxy. In such a case, a crafty combination of valid and invalid To headers can cause a proxy to allow an INVITE request into Asterisk without authentication since it believes the request is an in-dialog request. However, because of the bug described above, the request will look like an out-of-dialog request to Asterisk. Asterisk will then process the request as a new call. The result is that Asterisk can process calls from unvetted sources without any authentication. If you do not use a proxy for authentication, then this issue does not affect you. If your proxy is dialog-aware (meaning that the proxy keeps track of what dialogs are currently valid), then this issue does not affect you. If you use chan_pjsip instead of chan_sip, then this issue does not affect you.",
"evidence": "osv:CVE-2016-9938",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2016-9938",
"aliases": [
"CVE-2016-9938"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/asterisk/asterisk",
"type": "GIT",
"events": [
{
"introduced": "affbc6907eb544bc6e049085de91002ca24ff930"
},
{
"last_affected": "3f2411a18dd2c71225a706af2fed6e2e719da727"
}
],
"database_specific": {
"extracted_events": [
{
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"range": [
{
"introduced": "11.0.0"
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{
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"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.0.0:*:*:*:*:*:*:*",
"range": [
{
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{
"last_affected": "11.0.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.0:beta1:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0-beta1"
},
{
"last_affected": "11.0.0-beta1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.0:beta2:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0-beta2"
},
{
"last_affected": "11.0.0-beta2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0-rc1"
},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.0.0:rc1:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.0:rc2:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.0.0:rc2:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.0-rc2"
},
{
"last_affected": "11.0.0-rc2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.1"
},
{
"last_affected": "11.0.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.0.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.0.2"
},
{
"last_affected": "11.0.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.1.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.0"
},
{
"last_affected": "11.1.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.1.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.0"
},
{
"last_affected": "11.1.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.1.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.0-rc1"
},
{
"last_affected": "11.1.0-rc1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.1.0:rc1:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.1.0:rc3:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.0-rc3"
},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.1.0:rc3:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.1.1:*:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.1.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.1.2"
},
{
"last_affected": "11.1.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.2.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.2.0"
},
{
"last_affected": "11.2.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.2.0:*:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.2.0:rc1:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.2.0:rc1:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.2.0:rc2:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.2.0:rc2:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.2.1:*:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.2.2:*:*:*:*:*:*:*",
"range": [
{
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},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.3.0:*:*:*:*:*:*:*",
"range": [
{
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{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.3.0:*:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.4.0:*:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.4.0:*:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.5.0:*:*:*:*:*:*:*",
"range": [
{
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{
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],
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{
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{
"cpe": "cpe:2.3:a:digium:asterisk:11.5.1:*:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.6.0:*:*:*:*:*:*:*",
"range": [
{
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},
{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6.0:*:*:*:lts:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
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{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6.0:-:*:*:*:*:*:*",
"range": [
{
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},
{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.6.1:*:*:*:*:*:*:*",
"range": [
{
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{
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],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert1:*:*:*:*:*:*",
"range": [
{
"introduced": "11.6-cert1"
},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert1:*:*:lts:*:*:*",
"range": [
{
"introduced": "11.6-cert1"
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{
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],
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},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.7.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.7.0"
},
{
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}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.8.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.8.0"
},
{
"last_affected": "11.8.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.8.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.8.1"
},
{
"last_affected": "11.8.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.9.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.9.0"
},
{
"last_affected": "11.9.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.10.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.10.0"
},
{
"last_affected": "11.10.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.10.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.10.1"
},
{
"last_affected": "11.10.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.10.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.10.2"
},
{
"last_affected": "11.10.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.11.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.11.0"
},
{
"last_affected": "11.11.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.12.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.12.0"
},
{
"last_affected": "11.12.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.12.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.12.1"
},
{
"last_affected": "11.12.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.13.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.13.0"
},
{
"last_affected": "11.13.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.13.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.13.1"
},
{
"last_affected": "11.13.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.14.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.14.0"
},
{
"last_affected": "11.14.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.14.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.14.1"
},
{
"last_affected": "11.14.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.14.2:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.14.2"
},
{
"last_affected": "11.14.2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.15.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.15.0"
},
{
"last_affected": "11.15.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.15.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.15.1"
},
{
"last_affected": "11.15.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.16.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.16.0"
},
{
"last_affected": "11.16.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.17.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.17.0"
},
{
"last_affected": "11.17.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.17.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.17.1"
},
{
"last_affected": "11.17.1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.18.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.18.0"
},
{
"last_affected": "11.18.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.19.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.19.0"
},
{
"last_affected": "11.19.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.20.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.20.0"
},
{
"last_affected": "11.20.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.21.0:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.21.0"
},
{
"last_affected": "11.21.0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:asterisk:11.21.1:*:*:*:*:*:*:*",
"range": [
{
"introduced": "11.21.1"
},
{
"last_affected": "11.21.1"
}
],
"source": "CPE_STRING"
},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert5:*:*:lts:*:*:*",
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{
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],
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{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert7:*:*:lts:*:*:*",
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],
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},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert8:*:*:lts:*:*:*",
"range": [
{
"introduced": "11.6-cert8"
},
{
"last_affected": "11.6-cert8"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6:cert9:*:*:lts:*:*:*",
"range": [
{
"introduced": "11.6-cert9"
},
{
"last_affected": "11.6-cert9"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6.0:rc1:*:*:*:*:*:*",
"range": [
{
"introduced": "11.6.0-rc1"
},
{
"last_affected": "11.6.0-rc1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:digium:certified_asterisk:11.6.0:rc2:*:*:*:*:*:*",
"range": [
{
"introduced": "11.6.0-rc2"
},
{
"last_affected": "11.6.0-rc2"
}
],
"source": "CPE_STRING"
}
]
}
}
],
"versions": [
"11.0.0",
"11.0.0-beta1",
"11.0.0-beta2",
"11.0.0-rc1",
"11.0.0-rc2",
"11.0.1",
"11.0.2",
"11.1.0",
"11.1.0-rc1",
"11.1.0-rc2",
"11.1.0-rc3",
"11.1.1",
"11.1.2",
"11.10.0",
"11.10.1",
"11.10.2",
"11.11.0",
"11.12.0",
"11.12.1",
"11.13.0",
"11.13.1",
"11.14.0",
"11.14.1",
"11.14.2",
"11.15.0",
"11.15.1",
"11.16.0",
"11.17.0",
"11.17.1",
"11.18.0",
"11.19.0",
"11.2.0",
"11.2.0-rc1",
"11.2.0-rc2",
"11.2.1",
"11.2.2",
"11.20.0",
"11.21.0",
"11.21.1",
"11.21.2",
"11.22.0",
"11.22.0-rc1",
"11.23.0",
"11.23.0-rc1",
"11.23.1",
"11.24.0",
"11.24.1",
"11.25.0",
"11.3.0",
"11.3.0-rc1",
"11.3.0-rc2",
"11.4.0",
"11.4.0-rc1",
"11.4.0-rc2",
"11.4.0-rc3",
"11.5.0",
"11.5.0-rc1",
"11.5.0-rc2",
"11.5.1",
"11.6-cert10",
"11.6-cert11",
"11.6-cert12",
"11.6-cert13",
"11.6-cert14",
"11.6-cert15",
"11.6-cert1_rc1",
"11.6-cert1_rc2",
"11.6-cert2",
"11.6-cert3",
"11.6-cert4",
"11.6-cert5",
"11.6-cert6",
"11.6-cert7",
"11.6-cert8",
"11.6-cert9",
"11.6.0",
"11.6.0-rc1",
"11.6.0-rc2",
"11.6.1",
"11.7.0",
"11.8.0",
"11.8.1",
"11.9.0",
"13.0.0",
"13.0.0-beta1",
"13.0.0-beta2",
"13.0.0-beta3",
"13.0.1",
"13.0.2",
"13.1.0",
"13.1.1",
"13.10.0",
"13.10.0-rc1",
"13.11.0",
"13.11.1",
"13.11.2",
"13.12.0",
"13.12.1",
"13.12.2",
"13.13.0",
"13.2.0",
"13.2.1",
"13.3.0",
"13.3.1",
"13.3.2",
"13.4.0",
"13.5.0",
"13.6.0",
"13.7.0",
"13.7.1",
"13.7.2",
"13.8.0",
"13.8.0-rc1",
"13.8.1",
"13.8.2",
"13.9.0",
"13.9.1",
"14.0.0",
"14.0.0-beta1",
"14.0.0-beta2",
"14.0.0-rc1",
"14.0.0-rc2",
"14.0.1",
"14.0.2",
"14.1.0",
"14.1.1",
"14.1.2",
"14.2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-9938.json"
}
}
],
"modified": "2026-10-24T10:30:20.123304936Z",
"provider": "osv",
"references": [],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2016-9938",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 430192,
"published_at": "2016-12-12T21:59:01.617+00:00"
}