CVE-2020-22217
CVE-2020-22217 is a medium-severity vulnerability in C-ares with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Medium (CVSS 3.x base score 5.9)
- EPSS exploit prediction: 1% (53rd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: C-ares
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2020-22217?
- 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.
- How severe is CVE-2020-22217?
- CVE-2020-22217 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2020-22217 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2020-22217?
- CVE-2020-22217 primarily affects C-ares. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2020-22217?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2020-22217 published?
- CVE-2020-22217 was published on 2023-08-22 and last updated on 2026-06-17.
References
- https://github.com/c-ares/c-ares/issues/333
- https://lists.debian.org/debian-lts-announce/2023/09/msg00014.html
Affected products (3)
- cpe:2.3:a:c-ares:c-ares:1.16.1:*:*:*:*:*:*:*
- cpe:2.3:a:c-ares:c-ares:1.17.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
More vulnerabilities in C-ares
- CVE-2016-5180 — Critical (CVSS 9.8): Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attackers to…
- CVE-2017-1000381 — High (CVSS 7.5): The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered to read…
- CVE-2025-62408 — Medium (CVSS 5.9): c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum attempts…
- CVE-2024-25629 — Medium (CVSS 4.4): c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files…
- CVE-2020-14354 — Low (CVSS 3.3): A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to…
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- CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
- CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…