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Fencer Vulns
medium 6.5

CVE-2022-31743 json

Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with other browsers.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-53141

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 40%
public exploits
0
none known

Summary

Firefox's HTML parser did not correctly interpret HTML comment tags, resulting in an incongruity with other browsers. This could have been used to escape HTML comments on pages that put user-controlled data in them. This vulnerability affects Firefox < 101.

Patch / fix

  • Mozilla Firefox 101
  • firefox Ubuntu 18.04 LTS 101.0.1+build1-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 101.0.1+build1-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2022-31743

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 101.0-1.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:12121-1

  • firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 101.0-r0
  • librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 101.0-r0

alpine advisories ALPINE-CVE-2022-31743

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

  • firefox Arch Linux 101.0-1

arch linux advisories AVG-2760

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1747388 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Firefox

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.