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🛡️ CVE-2024-25629 — c-ares

🟡 CVSS 4.4 — Medium ✅ No Known Exploit CWE-127 NVD
4.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2024-25629 is classified as CWE-127: Buffer Under-read. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations prior to the targeted buffer.

Affected software

CVE-2024-25629 is recorded against 2 packages.

  • c-ares (fixed in 1.27.0)
  • fedora

Timeline and source

Published on 23 February 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org
github.com
github.com
lists.fedoraproject.org
lists.fedoraproject.org
lists.fedoraproject.org

Other advisories for this package

c-ares has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-127: Buffer Under-read) in other software:

CVE-2024-25629 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 4.4
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CWE CWE-127
Public Exploit ✅ No
Source NVD
Published 2024-02-23
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
c-ares — 1.27.0
fedora — —

References

Similar Threats

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