CVE-2023-31147

MediumCVSS 6.5/10Last modified Jun 17, 2026

Description

c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-330

Affected software

No affected versions have been published.

Timeline

Published
May 25, 2023
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2023-31147: Medium severity, CVSS 6.5 | Vulnix