CVE-2023-31147
c-ares: Insufficient randomness in generation of DNS query IDs
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · May 22, 2023
Updated · June 28, 2026
Description
A vulnerability was found in c-ares. This issue occurs when /dev/urandom or RtlGenRandom() are unavailable, c-ares will use rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand(), so it will generate predictable output.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-330 · Use of Insufficiently Random Values