CVE-2021-32921

medium

Description

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.

References

Advisories
More

https://www.debian.org/security/2021/dsa-4916

https://security.gentoo.org/glsa/202105-15

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/

https://lists.debian.org/debian-lts-announce/2021/06/msg00018.html

https://lists.debian.org/debian-lts-announce/2021/06/msg00016.html

http://www.openwall.com/lists/oss-security/2021/05/14/2

http://www.openwall.com/lists/oss-security/2021/05/13/1

https://euvd.enisa.europa.eu/vulnerability/EUVD-2021-19643

https://blog.prosody.im/prosody-0.11.9-released/

Details

Source: Mitre, NVD

Published: 2021-05-13

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 5.9

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

Severity: Medium

EPSS

EPSS: 0.01601