CVE-2024-25629 - CVE House
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Status published Medium CVE-2024-25629

c-ares out of bounds read in ares__read_line()

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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CVE-2025-31498
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CVE-2023-32067
0-byte UDP payload DoS in c-ares
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CVE-2023-31147
Insufficient randomness in generation of DNS query IDs in c-ares
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CVE-2023-31130
Buffer Underwrite in ares_inet_net_pton()
Medium 4.1

Affected Vendor

Affected Software

c-ares
Vulnerable Versions:
< 1.27.0

Timeline

Official Publish: February 23rd, 2024
Last Modified: February 13th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-127

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.