CVE-2021-32921

5.9 mediumEPSS 1.6%

Medium (5.9). EPSS 1.6% chance of exploitation in the next 30 days.

An issue was discovered in Prosody before 0.11.9. It does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.

Severity

CVSS 3.1

5.9 medium

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

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 75% of CVEs (scores of 2026-10-31)
CWE: CWE-362
Published: 2021-05-13
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

debian:debian_linux
fedoraproject:fedora
prosody:prosody

References

http://www.openwall.com/lists/oss-security/2021/05/13/1
http://www.openwall.com/lists/oss-security/2021/05/14/2
https://blog.prosody.im/prosody-0.11.9-released/
https://lists.debian.org/debian-lts-announce/2021/06/msg00016.html
https://lists.debian.org/debian-lts-announce/2021/06/msg00018.html

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