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Fencer Vulns
medium 6.5

CVE-2022-1834 json

When displaying the sender of an email, and the sender name contained the Braille Pattern Blank space character multiple times, Thunderbird…

published 2022-12-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-25110

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

When displaying the sender of an email, and the sender name contained the Braille Pattern Blank space character multiple times, Thunderbird would have displayed all the spaces. This could have been used by an attacker to send an email message with the attacker's digital signature, that was shown with an arbitrary sender email address chosen by the attacker. If the sender name started with a false email address, followed by many Braille space characters, the attacker's email address was not visible. Because Thunderbird compared the invisible sender address with the signature's email address, if the signing key or certificate was accepted by Thunderbird, the email was shown as having a valid digital signature. This vulnerability affects Thunderbird < 91.10.

Patch / fix

  • Mozilla Thunderbird 91.10
  • thunderbird Debian 14, Debian 13, Debian 12 1:91.10.0-1

debian advisories DEBIAN-CVE-2022-1834

  • thunderbird Ubuntu 18.04 LTS 1:91.11.0+build2-0ubuntu0.18.04.1
  • thunderbird Ubuntu 20.04 LTS 1:91.11.0+build2-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:91.11.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2022-1834

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 91.10.0-1.el8_6
  • thunderbird RHEL 9 91.10.0-1.el9_0
  • thunderbird RHEL 7 91.10.0-1.el7_9
  • thunderbird RHEL 8.2 EUS 91.10.0-1.el8_2
  • thunderbird RHEL 8.1 E4S 91.10.0-1.el8_1
  • thunderbird RHEL 8.4 EUS 91.10.0-1.el8_4

red hat advisories RHSA-2022:4890RHSA-2022:4888RHSA-2022:4887RHSA-2022:4889RHSA-2022:4892RHSA-2022:4891

  • MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Workstation Extension 15 SP3, SLE Module for Package Hub 15 SP4 +3 more 91.10.0-150200.8.73.1

suse advisories SUSE-SU-2022:2062-1

  • MozillaThunderbird openSUSE Tumbleweed 91.10.0-1.1

opensuse advisories openSUSE-SU-2024:12117-1

  • thunderbird Rocky Linux 8 91.10.0-1.el8_6

rocky linux advisories RLSA-2022:4887

  • thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 91.10.0-r0

alpine advisories ALPINE-CVE-2022-1834

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

  • thunderbird Arch Linux 91.10-1

arch linux advisories AVG-2761

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-2022-1834 updated cvss 7.5

Mozilla: Braille space character caused incorrect sender email to be shown for a digitally signed email

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 91.10.0-1.el8_6
    fixed: vendor fix RHSA-2022:4887
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 91.10.0-1.el9_0
    fixed: vendor fix RHSA-2022:4892
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird 91.10.0-1.el8_1
    fixed: vendor fix RHSA-2022:4888
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird 91.10.0-1.el8_2
    fixed: vendor fix RHSA-2022:4890
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird 91.10.0-1.el8_4
    fixed: vendor fix RHSA-2022:4889
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 91.10.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 91.10.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 91.10.0-1.el7_9
    fixed: vendor fix RHSA-2022:4891

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
partial
Assessed
18 mo ago

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

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:H/I:N/A:N
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products

  • Mozilla Thunderbird

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.