c-ares is a C library for asynchronous DNS requests. ares__read_line() is used to parse local configuration files such as /etc/resolv.conf, /etc/nsswitch.conf, the HOSTALIASES file, and if using a c-ares version prior to 1.27.0, the /etc/hosts file. If any of these configuration files has an embedded NULL character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist.
CVE-2024-25629
This medium-severity CVE scores 4.4 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 83% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 4.4
- EG Score
- 4.4(medium)
- EPSS
- 27.1%
- KEV
- Not listed
Published
February 23, 2024
Last Modified
February 5, 2025
References (10)
- security-advisories@githubhttps://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183
- security-advisories@githubhttps://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q
- security-advisories@githubhttps://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/
- security-advisories@githubhttps://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/
- security-advisories@githubhttps://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/
- af854a3a-2127-422b-91ae-364da2661108https://github.com/c-ares/c-ares/commit/a804c04ddc8245fc8adf0e92368709639125e183
- af854a3a-2127-422b-91ae-364da2661108https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q
- af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/[email protected]/message/2P76QYINQNPEHUTEEDOUYIRZ2X6UVZ5K/
- af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/[email protected]/message/CSCMTSPDIE2UHU34TIXQQHZ6JTE3Y3VF/
- af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/[email protected]/message/GX37LFPFQ3T6FFMMFYQTEGIQXXN7F27U/
Vendor Advisories for CVE-2024-25629(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(10)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | libc-ares2 (1.14.0-1ubuntu0.2+esm2) @ bionic | 2026-05-24 | ubuntu |
| redhat | nodejs-1:16.20.2-9.el9_0 | 2024-07-23 | redhat |
| redhat | nodejs-1:16.20.2-6.el9_2.3 | 2024-07-16 | redhat |
| redhat | c-ares-0:1.13.0-11.el8_10 | 2024-07-02 | redhat |
| redhat | c-ares-0:1.19.1-2.el9_4 | 2024-06-11 | redhat |
| redhat | nodejs-1:16.20.2-8.el9_4 | 2024-05-20 | redhat |
| redhat | nodejs:20-9040020240419140200.rhel9 | 2024-05-15 | redhat |
| redhat | nodejs:18-9040020240422140329.rhel9 | 2024-05-09 | redhat |
| redhat | nodejs:18-8090020240429131734.a75119d5 | 2024-05-09 | redhat |
| redhat | nodejs:20-8090020240422150739.a75119d5 | 2024-05-09 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(10)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
- Microsoft MSRCCVE-2024-256292024-02-26
c-ares out of bounds read in ares__read_line()
- Red HatRHSA-2024:2778LOW2024-02-23
RHSA-2024:2778 — Low
- Red HatRHSA-2024:2779LOW2024-02-23
RHSA-2024:2779 — Low
- Red HatRHSA-2024:2780LOW2024-02-23
RHSA-2024:2780 — Low
- Red HatRHSA-2024:2853LOW2024-02-23
RHSA-2024:2853 — Low
- Red HatRHSA-2024:2910LOW2024-02-23
RHSA-2024:2910 — Low
- Red HatRHSA-2024:3842LOW2024-02-23
RHSA-2024:3842 — Low
- Red HatRHSA-2024:4249LOW2024-02-23
RHSA-2024:4249 — Low
- Red HatRHSA-2024:4559LOW2024-02-23
RHSA-2024:4559 — Low
- UbuntuUSN-6676-1MEDIUM
c-ares vulnerability
Data Freshness Timeline
(refreshed 10× in last 7d / 47× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-15 16:56 UTCEPSS rescore
- 2026-07-15 16:56 UTCEPSS rescore
- 2026-07-15 01:59 UTCEPSS rescore
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- 2026-07-14 18:55 UTCOSV refresh
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- 2026-07-01 15:05 UTCEPSS rescore
- 2026-06-30 23:21 UTCEPSS rescore
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- 2026-06-29 14:05 UTCEPSS rescore
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- 2026-06-28 14:06 UTCEPSS rescore
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- 2026-06-27 03:07 UTCEPSS rescore
- 2026-06-26 19:39 UTCOSV refresh
- 2026-06-25 13:48 UTCEPSS rescore
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- 2026-06-24 14:04 UTCEPSS rescore
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- 2026-06-12 23:11 UTCEPSS rescore
- 2026-06-11 13:59 UTCEPSS rescore
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- 2026-06-10 22:17 UTCEPSS rescore
- 2026-06-10 13:21 UTCEPSS rescore
- 2026-06-10 13:21 UTCEPSS rescore
- 2026-06-09 05:00 UTCOSV refresh
- 2026-06-08 14:16 UTCEPSS rescore
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- 2026-05-29 13:43 UTCEPSS rescore
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- 2026-05-26 07:18 UTCEPSS rescore
- 2026-05-24 07:59 UTCEG score recompute
- 2026-05-24 07:59 UTCVendor advisory
Related CVEs(same vendor + same CWE)
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Same CWE
10 shownCWE-125
- CVE-2014-2898EG 9.8CRITICAL
- CVE-2014-2897EG 9.8CRITICAL
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- CVE-1999-0006EG 9.8EPSS 96%CRITICAL
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- CVE-2016-5198NVD 8.8EG 9.0 KEVEPSS 98%HIGH
- CVE-2016-4523NVD 7.5EG 9.0 KEVEPSS 98%HIGH
Frequently asked(5)
What is CVE-2024-25629?
When was CVE-2024-25629 disclosed?
Is CVE-2024-25629 actively exploited?
What is the CVSS score of CVE-2024-25629?
How do I remediate CVE-2024-25629?
Dependency Blast Radius
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