Security advisory
An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-28242
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 04:21 UTC · Revision 1
Source evidence
An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.
osv:CVE-2020-28242
Complete source record
{
"id": "f89d1c48ca2486ddb0482e944af30728c3db5804a9fc129cc154a9b4c8185b43",
"url": "https://osv.dev/vulnerability/CVE-2020-28242",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-28242",
"summary": "An issue was discovered in Asterisk Open Source 13.x before 13.37.1, 16.x before 16.14.1, 17.x before 17.8.1, and 18.x before 18.0.1 and Certified Asterisk before 16.8-cert5. If Asterisk is challenged on an outbound INVITE and the nonce is changed in each response, Asterisk will continually send INVITEs in a loop. This causes Asterisk to consume more and more memory since the transaction will never terminate (even if the call is hung up), ultimately leading to a restart or shutdown of Asterisk. Outbound authentication must be configured on the endpoint for this to occur.",
"evidence": "osv:CVE-2020-28242",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-28242",
"aliases": [
"CVE-2020-28242"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/asterisk/asterisk",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "d436f568583184a13aa46349af5a3f0907087b44"
},
{
"introduced": "85335355efb2d7914a1fe20ed31afcef15fd210c"
},
{
"fixed": "57693c3d5059c69222378b798cacc4685b0985e6"
},
{
"introduced": "a65908f83e2f17a3aca7eb39c8e06045aca02674"
},
{
"fixed": "372fccb6b26c38933f6df083f387f6c21865e017"
},
{
"introduced": "5ffe12b6ef30cd503f85d75745fd8d9c2cfafe47"
},
{
"fixed": "587c70514effa9ccfadd1ffb8ee7af041d733e0a"
},
{
"introduced": "2c1bba3cbec008c8ce35c78a2c79f9f207ea58bc"
},
{
"fixed": "3c299d2aa03a2f1f2b6d93ab5661eac900308118"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:asterisk:certified_asterisk:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"last_affected": "16.8.0"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "13.0"
},
{
"fixed": "13.37.1"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "16.0"
},
{
"fixed": "16.14.1"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "17.0"
},
{
"fixed": "17.8.1"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:sangoma:asterisk:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "18.0"
},
{
"fixed": "18.0.1"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"18.0.0",
"17.8.0",
"16.14.0",
"13.37.0",
"13.37.0-rc1",
"16.14.0-rc1",
"17.8.0-rc1",
"16.8.0",
"16.8.0-rc2",
"16.8.0-rc1"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-28242.json"
}
}
],
"modified": "2026-10-24T10:30:17.642608782Z",
"provider": "osv",
"references": [
"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QUS54QTQCYKR36EIULYD544GXDA644HB/",
"https://lists.debian.org/debian-lts-announce/2022/04/msg00001.html"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "9.0"
},
{
"last_affected": "9.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*"
],
"vendor_product": "fedoraproject:fedora",
"extracted_events": [
{
"range": [
{
"introduced": "33"
},
{
"last_affected": "33"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2020-28242",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 429611,
"published_at": "2020-11-06T06:15:11.93+00:00"
}