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Fencer Vulns
high 7.5

CVE-2021-37601 json

muc.lib.lua in Prosody 0.11.0 through 0.11.9 allows remote attackers to obtain sensitive information (list of admins, members, owners, and…

published 2021-07-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-24159

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

muc.lib.lua in Prosody 0.11.0 through 0.11.9 allows remote attackers to obtain sensitive information (list of admins, members, owners, and banned entities of a Multi-User chat room) in some common configurations.

Patch / fix

  • prosody Debian 14, Debian 13, Debian 12 0.11.9-2

debian advisories DEBIAN-CVE-2021-37601

  • prosody openSUSE Tumbleweed 0.11.10-1.2
  • prosody Package Hub 15 SP3, openSUSE Leap 15.3 0.11.10-bp153.2.6.2

opensuse advisories openSUSE-SU-2024:11197-1openSUSE-SU-2021:1173-1

  • prosody Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 0.11.10-r0

alpine advisories ALPINE-CVE-2021-37601

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • prosody Arch Linux 1:0.11.10-1

arch linux advisories AVG-2237

Exploit prediction

2.33% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • prosody.im https://prosody.im/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AC:L/AV:N/A:N/C:H/I:N/PR:N/S:U/UI:N
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.