MediumFix available
c-ares — security advisory
Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
- Products
- c-ares
- Affected versions
- 1.10.0-2, 1.10.0-3, 1.10.0-3ubuntu0.1, 1.10.0-3ubuntu0.2, 1.10.0-3ubuntu0.2+esm1, 1.10.0-3ubuntu0.2+esm2, 1.10.0-3ubuntu0.2+esm3, 1.13.0-2, 1.13.0-3, 1.14.0-1, 1.14.0-1ubuntu0.1, 1.14.0-1ubuntu0.2, 1.14.0-1ubuntu0.2+esm1, 1.14.0-1ubuntu0.2+esm2, 1.15.0-1build1, 1.15.0-1ubuntu0.1, 1.15.0-1ubuntu0.2, 1.15.0-1ubuntu0.3
- Fixed versions
- 1.10.0-3ubuntu0.2+esm4, 1.14.0-1ubuntu0.2+esm3, 1.15.0-1ubuntu0.4
- CVEs
- CVE-2020-22217
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 16:39 UTC · Revision 1
Source evidence
Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.
osv:UBUNTU-CVE-2020-22217
c-ares
Fixed versions: 1.10.0-3ubuntu0.2+esm4
c-ares
Fixed versions: 1.14.0-1ubuntu0.2+esm3
c-ares
Fixed versions: 1.15.0-1ubuntu0.4
Complete source record
{
"id": "5552e9f2125d05cffb55df961d5378d2028ad5f1622b4699aaca216d2a843a5e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-22217",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2020-22217",
"summary": "Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_parse_soa_reply.c.",
"evidence": "osv:UBUNTU-CVE-2020-22217",
"products": [
{
"name": {
"value": "c-ares",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.10.0-3ubuntu0.2+esm4",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1.10.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3ubuntu0.2",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3ubuntu0.2+esm1",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3ubuntu0.2+esm2",
"evidence": "/affected/0/versions"
},
{
"value": "1.10.0-3ubuntu0.2+esm3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "c-ares",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.14.0-1ubuntu0.2+esm3",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.13.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "1.13.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "1.14.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.14.0-1ubuntu0.1",
"evidence": "/affected/1/versions"
},
{
"value": "1.14.0-1ubuntu0.2",
"evidence": "/affected/1/versions"
},
{
"value": "1.14.0-1ubuntu0.2+esm1",
"evidence": "/affected/1/versions"
},
{
"value": "1.14.0-1ubuntu0.2+esm2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "c-ares",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.15.0-1ubuntu0.4",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.15.0-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1.15.0-1ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "1.15.0-1ubuntu0.2",
"evidence": "/affected/2/versions"
},
{
"value": "1.15.0-1ubuntu0.3",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2020-22217",
"aliases": [
"UBUNTU-CVE-2020-22217"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.10.0-3ubuntu0.2+esm4"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.10.0-2",
"1.10.0-3",
"1.10.0-3ubuntu0.1",
"1.10.0-3ubuntu0.2",
"1.10.0-3ubuntu0.2+esm1",
"1.10.0-3ubuntu0.2+esm2",
"1.10.0-3ubuntu0.2+esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-22217.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc-ares2",
"binary_version": "1.10.0-3ubuntu0.2+esm4"
}
],
"availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
"priority_reason": "Only an out-of-bounds read, so denial of service only"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.14.0-1ubuntu0.2+esm3"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/ubuntu/c-ares?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1.13.0-2",
"1.13.0-3",
"1.14.0-1",
"1.14.0-1ubuntu0.1",
"1.14.0-1ubuntu0.2",
"1.14.0-1ubuntu0.2+esm1",
"1.14.0-1ubuntu0.2+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-22217.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc-ares2",
"binary_version": "1.14.0-1ubuntu0.2+esm3"
}
],
"availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
"priority_reason": "Only an out-of-bounds read, so denial of service only"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.15.0-1ubuntu0.4"
}
]
}
],
"package": {
"name": "c-ares",
"purl": "pkg:deb/ubuntu/c-ares?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.15.0-1build1",
"1.15.0-1ubuntu0.1",
"1.15.0-1ubuntu0.2",
"1.15.0-1ubuntu0.3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-22217.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libc-ares2",
"binary_version": "1.15.0-1ubuntu0.4"
}
],
"availability": "No subscription required",
"priority_reason": "Only an out-of-bounds read, so denial of service only"
}
}
],
"modified": "2026-10-21T23:11:56.409511679Z",
"provider": "osv",
"upstream": [
"CVE-2020-22217"
],
"references": [
"https://ubuntu.com/security/CVE-2020-22217",
"https://ubuntu.com/security/notices/USN-6376-1",
"https://www.cve.org/CVERecord?id=CVE-2020-22217",
"https://ubuntu.com/security/notices/USN-8951-1"
]
},
"related_cves": [
{
"value": "CVE-2020-22217",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 401082,
"published_at": "2023-08-22T19:16:00+00:00"
}