CVE-2021-32921

MEDIUM
Published May 13, 20215y ago · Modified Jun 17, 20262w ago
5.9 CVSS 3.1
Medium
Find Similar
Published May 13, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.9
Exploitability
2.2
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-362

Affected Products 6

VendorProductVersionRange
prosodyprosody* <0.11.9
lualua*≥5.2.0
fedoraprojectfedora32any
fedoraprojectfedora33any
fedoraprojectfedora34any
debiandebian_linux9.0any

References 10

  • openwall.com http://www.openwall.com/lists/oss-security/2021/05/13/1
    Mailing ListThird Party Advisory
  • openwall.com http://www.openwall.com/lists/oss-security/2021/05/14/2
    Mailing ListMitigationThird Party Advisory
  • blog.prosody.im https://blog.prosody.im/prosody-0.11.9-released/
    Release NotesVendor Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2021/06/msg00016.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2021/06/msg00018.html
    Third Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6MFFBZWXKPZEVZNQSVJNCUE7WRF3T7DG/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUN63AHEWB2WRROJHU3BVJRWLONCT2B7/
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LWJ2DG2DFJOEFEWOUN26IMYYWGSA2ZEE/
  • security.gentoo.org https://security.gentoo.org/glsa/202105-15
    Third Party Advisory
  • debian.org https://www.debian.org/security/2021/dsa-4916
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.