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Fencer Vulns
high 8.8

CVE-2022-0566 json

It may be possible for an attacker to craft an email message that causes Thunderbird to perform an out-of-bounds write of one byte when pro…

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-15684

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 54%
public exploits
0
none known

Summary

It may be possible for an attacker to craft an email message that causes Thunderbird to perform an out-of-bounds write of one byte when processing the message. This vulnerability affects Thunderbird < 91.6.1.

Patch / fix

  • Mozilla Thunderbird 91.6.1
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.6.1-1

debian advisories DEBIAN-CVE-2022-0566

  • thunderbird Ubuntu 18.04 LTS 1:91.7.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.7.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.6.1+build1-0ubuntu1

ubuntu advisories UBUNTU-CVE-2022-0566

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 8 91.7.0-2.el8_5
  • thunderbird RHEL 7 91.7.0-2.el7_9
  • thunderbird RHEL 8.1 E4S 91.7.0-2.el8_1
  • thunderbird RHEL 8.2 EUS 91.7.0-2.el8_2
  • thunderbird RHEL 8.4 EUS 91.7.0-2.el8_4

red hat advisories RHSA-2022:0847RHSA-2022:0845RHSA-2022:0850RHSA-2022:0843RHSA-2022:0853

  • MozillaThunderbird SLE Workstation Extension 15 SP3 91.6.1-8.54.1

suse advisories SUSE-SU-2022:0559-1

  • MozillaThunderbird openSUSE Tumbleweed 91.6.1-1.1
  • MozillaThunderbird openSUSE Leap 15.3 91.6.1-8.54.1

opensuse advisories openSUSE-SU-2024:11856-1openSUSE-SU-2022:0559-1

  • thunderbird AlmaLinux 8 91.7.0-2.el8_5.alma
  • thunderbird AlmaLinux 8 91.7.0-2.el8_5.alma.plus

almalinux advisories ALSA-2022:0845

  • thunderbird Rocky Linux 8 91.7.0-2.el8_5

rocky linux advisories RLSA-2022:0845

  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.6.2-r0

alpine advisories ALPINE-CVE-2022-0566

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-2022-0566 updated cvss 7.6

thunderbird: Crafted email could trigger an out-of-bounds write

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 thunderbird
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 91.7.0-2.el8_5
    fixed: vendor fix RHSA-2022:0845
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird 91.7.0-2.el8_1
    fixed: vendor fix RHSA-2022:0847
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird 91.7.0-2.el8_2
    fixed: vendor fix RHSA-2022:0843
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird 91.7.0-2.el8_4
    fixed: vendor fix RHSA-2022:0853
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 91.7.0-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 91.7.0-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 91.7.0-2.el7_9
    fixed: vendor fix RHSA-2022:0850
  • Red Hat Enterprise Linux 9 thunderbird
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
18 mo ago

Exploit prediction

0.73% chance of exploitation in the next 30 days, higher than 54% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • Mozilla Thunderbird

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.