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Fencer Vulns
medium 5.5

CVE-2022-3266 json

An out-of-bounds read can occur when decoding H264 video.

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-42668

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

An out-of-bounds read can occur when decoding H264 video. This results in a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

Patch / fix

  • Mozilla Firefox ESR 102.3
  • Mozilla Thunderbird 102.3
  • Mozilla Firefox 105
  • firefox-esr Debian 14, Debian 13, Debian 12 102.3.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:102.3.0-1

debian advisories DEBIAN-CVE-2022-3266

  • firefox Ubuntu 18.04 LTS 105.0+build2-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 105.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 18.04 LTS 1:102.4.2+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:102.4.2+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.4.2+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-3266

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

  • thunderbird RHEL 7 102.3.0-3.el7_9
  • thunderbird RHEL 9 102.3.0-3.el9_0
  • thunderbird RHEL 8 102.3.0-3.el8_6
  • firefox RHEL 8 102.3.0-6.el8_6
  • firefox RHEL 9 102.3.0-6.el9_0
  • firefox RHEL 7 102.3.0-6.el7_9
  • thunderbird RHEL 8.2 EUS 102.3.0-3.el8_2
  • thunderbird RHEL 8.1 E4S 102.3.0-3.el8_1

red hat advisories RHSA-2022:6715RHSA-2022:6710RHSA-2022:6716RHSA-2022:6717RHSA-2022:6708RHSA-2022:6713

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 102.4.0-150200.8.85.1

suse advisories SUSE-SU-2022:3800-1

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.3.0-r0

alpine advisories ALPINE-CVE-2022-3266

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

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-2022-3266 updated cvss 5.3

Mozilla: Out of bounds read when decoding H264

  • Red Hat Enterprise Linux 6 firefox, thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 102.3.0-6.el8_6, thunderbird 102.3.0-3.el8_6
    fixed: vendor fix RHSA-2022:6702
  • Red Hat Enterprise Linux AppStream (v. 9) firefox 102.3.0-6.el9_0, thunderbird 102.3.0-3.el9_0
    fixed: vendor fix RHSA-2022:6700
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 102.3.0-6.el8_1, thunderbird 102.3.0-3.el8_1
    fixed: vendor fix RHSA-2022:6703
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox 102.3.0-6.el8_2, thunderbird 102.3.0-3.el8_2
    fixed: vendor fix RHSA-2022:6707
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 102.3.0-6.el8_4, thunderbird 102.3.0-3.el8_4
    fixed: vendor fix RHSA-2022:6701
  • Red Hat Enterprise Linux Client (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 102.3.0-6.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 102.3.0-6.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 102.3.0-6.el7_9, thunderbird 102.3.0-3.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 102.3.0-6.el7_9
    fixed: vendor fix RHSA-2022:6711

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

CISA SSVC

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

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.mozilla.org https://bugzilla.mozilla.org/show_bug.cgi?id=1767360 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • Mozilla Firefox ESR
  • Mozilla Thunderbird
  • Mozilla Firefox

Classification

Weakness

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.