# CVE-2020-22217: c-ares: The c-ares C library defines asynchronous DNS (Domain Name System) requests and provides name resolving API.  Securit...

CVE-2020-22217 is fixed in 3 products on 1 platform, first by libc-ares2 1.15.0-1ubuntu0.4, released August 22, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-22217
- Priority: Routine
- CVSS: 5.9 (Moderate)
- EPSS: 0.0098
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2023

## Description

The c-ares C library defines asynchronous DNS (Domain Name System) requests and provides name resolving API.  Security Fix(es):  * c-ares: Heap buffer over read in ares_parse_soa_reply (CVE-2020-22217)  * c-ares: Buffer Underwrite in ares_inet_net_pton() (CVE-2023-31130)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | c-ares Debian 12.15 (bookworm) | 1.17.1-1 | [DEBIAN-CVE-2020-22217](https://patchblox.com/security/data/fix/linux/debian-cve-2020-22217.md) | Aug 22, 2023 |
| Linux | c-ares Debian 13.5 (trixie) | 1.17.1-1 | [DEBIAN-CVE-2020-22217](https://patchblox.com/security/data/fix/linux/debian-cve-2020-22217.md) | Aug 22, 2023 |
| Linux | c-ares Debian 14 | 1.17.1-1 | [DEBIAN-CVE-2020-22217](https://patchblox.com/security/data/fix/linux/debian-cve-2020-22217.md) | Aug 22, 2023 |
| Linux | c-ares RHEL 8 | 0:1.13.0-9.el8_9.1 | [RHSA-2023:7207](https://patchblox.com/security/data/fix/linux/rhsa-2023-7207.md) | Nov 14, 2023 |
| Linux | c-ares almalinux 8 | 1.13.0-9.el8_9.1 | [ALSA-2023:7207](https://patchblox.com/security/data/fix/linux/alsa-2023-7207.md) | Nov 14, 2023 |
| Linux | c-ares ol 8 | 0:1.13.0-9.el8_9.1 | [ELSA-2023-7207](https://patchblox.com/security/data/fix/linux/elsa-2023-7207.md) | Nov 22, 2023 |
| Linux | c-ares rocky 8 | 0:1.13.0-9.el8_9.1 | [RLSA-2023:7207](https://patchblox.com/security/data/fix/linux/rlsa-2023-7207.md) | Nov 28, 2023 |
| Linux | c-ares-devel RHEL 8 | 0:1.13.0-9.el8_9.1 | [RHSA-2023:7207](https://patchblox.com/security/data/fix/linux/rhsa-2023-7207.md) | Nov 14, 2023 |
| Linux | c-ares-devel almalinux 8 | 1.13.0-9.el8_9.1 | [ALSA-2023:7207](https://patchblox.com/security/data/fix/linux/alsa-2023-7207.md) | Nov 14, 2023 |
| Linux | c-ares-devel ol 8 | 0:1.13.0-9.el8_9.1 | [ELSA-2023-7207](https://patchblox.com/security/data/fix/linux/elsa-2023-7207.md) | Nov 22, 2023 |
| Linux | libc-ares2 Ubuntu 18.04.6 LTS (bionic) | 1.14.0-1ubuntu0.2+esm3 | [libc-ares2 1.14.0-1ubuntu0.2+esm3](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libc-ares2-1.14.0-1ubuntu0.2-esm3.md) | Sep 18, 2026 |
| Linux | libc-ares2 Ubuntu 20.04 LTS (focal) | 1.15.0-1ubuntu0.4 | [libc-ares2 1.15.0-1ubuntu0.4](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libc-ares2-1.15.0-1ubuntu0.4.md) | Aug 22, 2023 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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