CVE catalog
CVE-2020-22217
c-ares vulnerabilities
- Severity
- High · CVSS 8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.98% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | c-ares | sid | 1.34.9-1 | fixed |
| Debian | c-ares | forky | 1.34.8-1 | fixed |
| Debian | c-ares | trixie | 1.34.5-1+deb13u1 | fixed |
| Debian | c-ares | trixie-security | 1.34.5-1+deb13u1 | fixed |
| Debian | c-ares | bookworm | 1.18.1-3 | fixed |
| Ubuntu | c-ares | noble | 1.17.1-1 | fixed |
| Ubuntu | c-ares | 20.04 | 1.15.0-1build1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.3 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.4 | fixed |
| Ubuntu | c-ares | pro | 1.13.0-2 | vulnerable |
| Ubuntu | c-ares | pro | 1.13.0-3 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2+esm1 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2+esm2 | vulnerable |
| Ubuntu | c-ares | pro | 1.14.0-1ubuntu0.2+esm3 | fixed |
| Ubuntu | c-ares | 20.04 | 1.15.0-1build1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.3 | vulnerable |
| Ubuntu | c-ares | 20.04 | 1.15.0-1ubuntu0.4 | fixed |
| Ubuntu | c-ares | noble | 1.27.0-1.0ubuntu1.1 | fixed |
| Ubuntu | libc-ares-dev | noble | 1.27.0-1.0ubuntu1.1 | fixed |
| Ubuntu | libcares2 | noble | 1.27.0-1.0ubuntu1.1 | fixed |
| Suse | libcares2 | linux enterprise software development kit 12 sp5 | 1.9.1-9.18.1 | fixed |
| Suse | libcares2 | linux enterprise server 12 sp5 | 1.9.1-9.18.1 | fixed |
| Suse | libcares2 | linux enterprise server for sap applications 12 sp5 | 1.9.1-9.18.1 | fixed |
| Suse | libcares2 | linux enterprise workstation extension 12 sp5 | 1.9.1-9.18.1 | fixed |
| Ubuntu | c-ares | pro | 1.15.0-1build1 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.2 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.3 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.4 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.5 | vulnerable |
| Ubuntu | c-ares | pro | 1.15.0-1ubuntu0.5+esm1 | fixed |
| Ubuntu | c-ares | 22.04 | 1.17.1-1ubuntu1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1build1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.1 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.2 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.3 | vulnerable |
| Ubuntu | c-ares | 22.04 | 1.18.1-1ubuntu0.22.04.4 | fixed |
| Ubuntu | c-ares | 24.04 | 1.19.1-3 | vulnerable |
| Ubuntu | c-ares | 24.04 | 1.20.1-1 | vulnerable |
| Ubuntu | c-ares | 24.04 | 1.26.0-1 | vulnerable |
| Ubuntu | c-ares | 24.04 | 1.27.0-1 | vulnerable |
| Ubuntu | c-ares | 24.04 | 1.27.0-1.0ubuntu1 | vulnerable |
| Ubuntu | c-ares | 24.04 | 1.27.0-1.0ubuntu1.1 | fixed |
| Ubuntu | c-ares | 26.04 | 1.34.5-1 | vulnerable |
| Ubuntu | c-ares | 26.04 | 1.34.6-1 | vulnerable |
| Ubuntu | c-ares | 26.04 | 1.34.6-1ubuntu0.1 | vulnerable |
| Ubuntu | c-ares | 26.04 | 1.34.6-1ubuntu0.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | c-ares | source | sid | 1.17.1-1 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | forky | 1.17.1-1 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | trixie | 1.17.1-1 | not yet assigned | Not reported | Not reported |
| Debian | c-ares | source | bookworm | 1.17.1-1 | not yet assigned | Not reported | Not reported |
| Ubuntu | c-ares | deb | noble | 1.17.1-1 | Not reported | Not reported | Not reported |
| Ubuntu | c-ares | deb | 20.04 | 1.15.0-1ubuntu0.4 | Not reported | USN-6376-1 | Not reported |
| Ubuntu | c-ares | deb | pro | 1.14.0-1ubuntu0.2+esm3 | Not reported | UBUNTU-CVE-2020-22217 | Not reported |
| Ubuntu | c-ares | deb | 20.04 | 1.15.0-1ubuntu0.4 | Not reported | UBUNTU-CVE-2020-22217 | Not reported |
| Ubuntu | c-ares | deb | noble | 1.27.0-1.0ubuntu1.1 | Not reported | Not reported | Not reported |
| Ubuntu | libc-ares-dev | deb | noble | 1.27.0-1.0ubuntu1.1 | Not reported | Not reported | Not reported |
| Ubuntu | libcares2 | deb | noble | 1.27.0-1.0ubuntu1.1 | Not reported | Not reported | Not reported |
| Suse | libcares2 | rpm | linux enterprise software development kit 12 sp5 | 1.9.1-9.18.1 | Not reported | SUSE-SU-2023:3690-1 | Not reported |
| Suse | libcares2 | rpm | linux enterprise server 12 sp5 | 1.9.1-9.18.1 | Not reported | SUSE-SU-2023:3690-1 | Not reported |
| Suse | libcares2 | rpm | linux enterprise server for sap applications 12 sp5 | 1.9.1-9.18.1 | Not reported | SUSE-SU-2023:3690-1 | Not reported |
| Suse | libcares2 | rpm | linux enterprise workstation extension 12 sp5 | 1.9.1-9.18.1 | Not reported | SUSE-SU-2023:3690-1 | Not reported |
| Ubuntu | c-ares | deb | pro | 1.15.0-1ubuntu0.5+esm1 | Not reported | USN-8951-1 | Not reported |
| Ubuntu | c-ares | deb | 22.04 | 1.18.1-1ubuntu0.22.04.4 | Not reported | USN-8951-1 | Not reported |
| Ubuntu | c-ares | deb | 24.04 | 1.27.0-1.0ubuntu1.1 | Not reported | USN-8951-1 | Not reported |
| Ubuntu | c-ares | deb | 26.04 | 1.34.6-1ubuntu0.2 | Not reported | USN-8951-1 | Not reported |
OpenFactory catalog packages
Matching against OpenFactory catalog package versions is in progress.
[Debian 12 (Bookworm)]
- [libc-ares2]Unknown
Source package: [c-ares]
Details (2)
1.18.1-3· amd64 · bookwormFixed · Fixed:
1.17.1-1usn · c-ares · debian · bookworm; usn · c-ares · debian · 12
1.18.1-3· arm64 · bookwormFixed · Fixed:
1.17.1-1usn · c-ares · debian · bookworm; usn · c-ares · debian · 12
- [libc-ares-dev]Unknown
Source package: [c-ares]
Details (2)
1.18.1-3· amd64 · bookwormFixed · Fixed:
1.17.1-1usn · c-ares · debian · bookworm; usn · c-ares · debian · 12
1.18.1-3· arm64 · bookwormFixed · Fixed:
1.17.1-1usn · c-ares · debian · bookworm; usn · c-ares · debian · 12
[Debian 13 (Trixie)]
- [libc-ares2]Unknown
Source package: [c-ares]
Details (4)
1.34.5-1+deb13u1· all · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· all · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· all · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· all · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
- [libcares2]Unknown
Source package: [c-ares]
Details (4)
1.34.5-1+deb13u1· amd64 · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· arm64 · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· arm64 · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
- [libc-ares-dev]Unknown
Source package: [c-ares]
Details (4)
1.34.5-1+deb13u1· amd64 · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· arm64 · trixieFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· amd64 · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
1.34.5-1+deb13u1· arm64 · trixie-securityFixed · Fixed:
1.17.1-1usn · c-ares · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2023_7207.json]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2020-22217]
- [https://osv.dev/vulnerability/DLA-3567-1]
- [https://osv.dev/vulnerability/SUSE-SU-2023:3690-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2020-22217]
- [https://osv.dev/vulnerability/USN-6376-1]
- [https://osv.dev/vulnerability/USN-8951-1]
- [https://security-tracker.debian.org/tracker/CVE-2020-22217]
- [https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-22217.json]
- [https://ubuntu.com/security/notices/USN-8951-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2024/wid-sec-w-2024-0218.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]