HighFix available
asterisk — security advisory
Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.
- Products
- asterisk
- Affected versions
- Not specified
- Fixed versions
- 18.20.2-r0, 20.5.1-r0
- CVEs
- CVE-2023-37457
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 14:58 UTC · Revision 1
Source evidence
Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.
osv:ALPINE-CVE-2023-37457
asterisk
Fixed versions: 18.20.2-r0
asterisk
Fixed versions: 18.20.2-r0
asterisk
Fixed versions: 18.20.2-r0
asterisk
Fixed versions: 20.5.1-r0
asterisk
Fixed versions: 20.5.1-r0
asterisk
Fixed versions: 20.5.1-r0
asterisk
Fixed versions: 20.5.1-r0
asterisk
Fixed versions: 20.5.1-r0
asterisk
Fixed versions: 20.5.1-r0
Complete source record
{
"id": "4d8d06a2f949607448347005d1e4eb450a0a44529de4f51faa54dcd15a722281",
"url": "https://osv.dev/vulnerability/ALPINE-CVE-2023-37457",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ALPINE-CVE-2023-37457",
"summary": "Asterisk is an open source private branch exchange and telephony toolkit. In Asterisk versions 18.20.0 and prior, 20.5.0 and prior, and 21.0.0; as well as ceritifed-asterisk 18.9-cert5 and prior, the 'update' functionality of the PJSIP_HEADER dialplan function can exceed the available buffer space for storing the new value of a header. By doing so this can overwrite memory or cause a crash. This is not externally exploitable, unless dialplan is explicitly written to update a header based on data from an outside source. If the 'update' functionality is not used the vulnerability does not occur. A patch is available at commit a1ca0268254374b515fa5992f01340f7717113fa.",
"evidence": "osv:ALPINE-CVE-2023-37457",
"products": [
{
"name": {
"value": "asterisk",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "18.20.2-r0",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/package/name"
},
"prerequisites": [],
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{
"value": "18.20.2-r0",
"evidence": "/affected/1/ranges"
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"affected_versions": []
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{
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},
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"evidence": "/affected/2/ranges"
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{
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"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
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{
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"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
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{
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{
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"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/7/package/name"
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"fixed_versions": [
{
"value": "20.5.1-r0",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "20.5.1-r0",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "ALPINE-CVE-2023-37457",
"aliases": [
"ALPINE-CVE-2023-37457"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "19.0.0"
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{
"fixed": "18.20.2-r0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:apk/alpine/asterisk?arch=source",
"ecosystem": "Alpine:v3.16"
},
"database_specific": {
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},
"ecosystem_specific": {}
},
{
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"package": {
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{
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],
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"package": {
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"ecosystem": "Alpine:v3.22"
},
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],
"package": {
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"ecosystem": "Alpine:v3.23"
},
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{
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],
"package": {
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"ecosystem": "Alpine:v3.24"
},
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},
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}
],
"modified": "2026-10-26T17:17:58.630320236Z",
"provider": "osv",
"upstream": [
"CVE-2023-37457"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2023-37457"
]
},
"related_cves": [
{
"value": "CVE-2023-37457",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 454456,
"published_at": "2023-12-14T20:15:52.26+00:00"
}