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Fencer Vulns
high 7.5

CVE-2021-32919 json

An issue was discovered in Prosody before 0.11.9.

published 2021-05-13 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19641

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

An issue was discovered in Prosody before 0.11.9. The undocumented dialback_without_dialback option in mod_dialback enables an experimental feature for server-to-server authentication. It does not correctly authenticate remote server certificates, allowing a remote server to impersonate another server (when this option is enabled).

Patch / fix

  • prosody prosody 0.11.9
  • prosody Debian 14, Debian 13, Debian 12 0.11.9-1

debian advisories DEBIAN-CVE-2021-32919

  • prosody openSUSE Tumbleweed 0.11.10-1.2
  • prosody Package Hub 15 SP2 0.11.9-bp152.2.3.1
  • prosody openSUSE Leap 15.2 0.11.9-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:11197-1openSUSE-SU-2021:0751-1openSUSE-SU-2021:0728-1

  • prosody Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 0.11.9-r0

alpine advisories ALPINE-CVE-2021-32919

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 1:0.11.9-1

arch linux advisories AVG-1955

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32919 updated cvss 7.4

prosody: undocumented dialback-without-dialback option insecure

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
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 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-295 Improper Certificate Validation

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.