Medium
asterisk — security advisory
Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.
- Products
- asterisk
- Affected versions
- 1:13.1.0~dfsg-1.1ubuntu3, 1:13.1.0~dfsg-1.1ubuntu4, 1:13.1.0~dfsg-1.1ubuntu4.1, 1:13.1.0~dfsg-1.1ubuntu4.1+esm1, 1:13.17.2~dfsg-1ubuntu1, 1:13.17.2~dfsg-2ubuntu1, 1:13.18.1~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu1, 1:13.18.3~dfsg-1ubuntu2, 1:13.18.3~dfsg-1ubuntu3, 1:13.18.3~dfsg-1ubuntu4, 1:16.16.1~dfsg+~2.10-1, 1:16.16.1~dfsg-2, 1:16.16.1~dfsg-4, 1:16.16.1~dfsg-4build1, 1:16.2.1~dfsg-2build2, 1:16.2.1~dfsg-2build3, 1:16.2.1~dfsg-2ubuntu1, 1:18.10.0~dfsg+~cs6.10.40431411-2, 1:20.4.0~dfsg+~cs6.13.40431414-2, 1:20.5.0~dfsg+~cs6.13.40431414-1, 1:20.5.1~dfsg+~cs6.13.40431414-1, 1:20.5.2~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-1, 1:20.6.0~dfsg+~cs6.13.40431414-2, 1:20.6.0~dfsg+~cs6.13.40431414-2build3, 1:20.6.0~dfsg+~cs6.13.40431414-2build4, 1:20.6.0~dfsg+~cs6.13.40431414-2build5, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2, 1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3, 1:22.2.0~dfsg+~cs6.15.60671435-2, 1:22.3.0~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-1, 1:22.4.1~dfsg+~cs6.15.60671435-2, 1:22.5.1~dfsg+~cs6.15.60671435-1, 1:22.5.2~dfsg+~cs6.15.60671435-1
- Fixed versions
- Not specified
- CVEs
- CVE-2024-42491
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:10 UTC · Revision 1
Source evidence
Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.
osv:UBUNTU-CVE-2024-42491
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
asterisk
Fixed versions: Not specified
Complete source record
{
"id": "b81daf579cb13df7a1c3b2060c0a7faa99bf0d0edd2b8a2e65c81a21b75d58bf",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2024-42491",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2024-42491",
"summary": "Asterisk is an open-source private branch exchange (PBX). Prior to versions 18.24.3, 20.9.3, and 21.4.3 of Asterisk and versions 18.9-cert12 and 20.7-cert2 of certified-asterisk, if Asterisk attempts to send a SIP request to a URI whose host portion starts with `.1` or `[.1]`, and res_resolver_unbound is loaded, Asterisk will crash with a SEGV. To receive a patch, users should upgrade to one of the following versions: 18.24.3, 20.9.3, 21.4.3, certified-18.9-cert12, certified-20.7-cert2. Two workarounds are available. Disable res_resolver_unbound by setting `noload = res_resolver_unbound.so` in modules.conf, or set `rewrite_contact = yes` on all PJSIP endpoints. NOTE: This may not be appropriate for all Asterisk configurations.",
"evidence": "osv:UBUNTU-CVE-2024-42491",
"products": [
{
"name": {
"value": "asterisk",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:13.1.0~dfsg-1.1ubuntu3",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:13.17.2~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.17.2~dfsg-2ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.1~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu3",
"evidence": "/affected/1/versions"
},
{
"value": "1:13.18.3~dfsg-1ubuntu4",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:16.2.1~dfsg-2build2",
"evidence": "/affected/2/versions"
},
{
"value": "1:16.2.1~dfsg-2build3",
"evidence": "/affected/2/versions"
},
{
"value": "1:16.2.1~dfsg-2ubuntu1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:16.16.1~dfsg-2",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg-4",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg-4build1",
"evidence": "/affected/3/versions"
},
{
"value": "1:16.16.1~dfsg+~2.10-1",
"evidence": "/affected/3/versions"
},
{
"value": "1:18.10.0~dfsg+~cs6.10.40431411-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:20.4.0~dfsg+~cs6.13.40431414-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.0~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.1~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.5.2~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build3",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build4",
"evidence": "/affected/4/versions"
},
{
"value": "1:20.6.0~dfsg+~cs6.13.40431414-2build5",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.2.0~dfsg+~cs6.15.60671435-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.3.0~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.4.1~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.4.1~dfsg+~cs6.15.60671435-2",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.5.1~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "1:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "asterisk",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:22.5.2~dfsg+~cs6.15.60671435-1",
"evidence": "/affected/7/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2024-42491",
"aliases": [
"UBUNTU-CVE-2024-42491"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=esm-apps%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1:13.1.0~dfsg-1.1ubuntu3",
"1:13.1.0~dfsg-1.1ubuntu4",
"1:13.1.0~dfsg-1.1ubuntu4.1",
"1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-42491.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:13.1.0~dfsg-1.1ubuntu4.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"1:13.17.2~dfsg-1ubuntu1",
"1:13.17.2~dfsg-2ubuntu1",
"1:13.18.1~dfsg-1ubuntu1",
"1:13.18.3~dfsg-1ubuntu1",
"1:13.18.3~dfsg-1ubuntu2",
"1:13.18.3~dfsg-1ubuntu3",
"1:13.18.3~dfsg-1ubuntu4"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-42491.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:13.18.3~dfsg-1ubuntu4"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1:16.2.1~dfsg-2build2",
"1:16.2.1~dfsg-2build3",
"1:16.2.1~dfsg-2ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-42491.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail-imapstorage",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-voicemail-odbcstorage",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:16.2.1~dfsg-2ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:16.16.1~dfsg-2",
"1:16.16.1~dfsg-4",
"1:16.16.1~dfsg-4build1",
"1:16.16.1~dfsg+~2.10-1",
"1:18.10.0~dfsg+~cs6.10.40431411-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2024/UBUNTU-CVE-2024-42491.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "asterisk",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-config",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-dahdi",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mobile",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-modules",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mp3",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-mysql",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-ooh323",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-tests",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
},
{
"binary_name": "asterisk-vpb",
"binary_version": "1:18.10.0~dfsg+~cs6.10.40431411-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "asterisk",
"purl": "pkg:deb/ubuntu/asterisk?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"1:20.4.0~dfsg+~cs6.13.40431414-2",
"1:20.5.0~dfsg+~cs6.13.40431414-1",
"1:20.5.1~dfsg+~cs6.13.40431414-1",
"1:20.5.2~dfsg+~cs6.13.40431414-1",
"1:20.6.0~dfsg+~cs6.13.40431414-1",
"1:20.6.0~dfsg+~cs6.13.40431414-2",
"1:20.6.0~dfsg+~cs6.13.40431414-2build3",
"1:20.6.0~dfsg+~cs6.13.40431414-2build4",
"1:20.6.0~dfsg+~cs6.13.40431414-2build5"
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"modified": "2026-10-17T12:56:39.156724991Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2024-42491",
"https://www.cve.org/CVERecord?id=CVE-2024-42491",
"https://github.com/asterisk/asterisk/security/advisories/GHSA-v428-g3cw-7hv9",
"https://github.com/asterisk/asterisk/commit/42a2f4ccfa2c7062a15063e765916b3332e34cc4",
"https://github.com/asterisk/asterisk/commit/4f01669c7c41c9184f3cce9a3cf1b2ebf6201742",
"https://github.com/asterisk/asterisk/commit/50bf8d4d3064930d28ecf1ce3397b14574d514d2",
"https://github.com/asterisk/asterisk/commit/7a0090325bfa9d778a39ae5f7d0a98109e4651c8",
"https://github.com/asterisk/asterisk/commit/a15050650abf09c10a3c135fab148220cd41d3a0"
]
},
"related_cves": [
{
"value": "CVE-2024-42491",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355913,
"published_at": "2024-09-05T18:15:00+00:00"
}