CVE catalog

CVE-2021-38495

thunderbird: CVE-2021-38495

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: Sep 22, 2021, 2:47:35 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.11% · Oct 25, 2026

Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 91.1 and Firefox ESR < 91.1.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	thunderbird	sid	`1:153.5.1esr-1`	not affected
Debian	thunderbird	forky	`1:153.5.0esr-1`	not affected
Debian	thunderbird	trixie	`1:140.12.0esr-1~deb13u1`	not affected
Debian	thunderbird	trixie-security	`1:153.5.1esr-1~deb13u2`	not affected
Debian	thunderbird	bookworm	`1:140.12.0esr-1~deb12u1`	not affected
Debian	thunderbird	bookworm-security	`1:153.5.1esr-1~deb12u1`	not affected
Ubuntu	thunderbird	18.04	`1:52.4.0+build1-0ubuntu2`	vulnerable
Ubuntu	thunderbird	18.04	`1:52.6.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	18.04	`1:52.7.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	18.04	`1:52.8.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:52.9.1+build3-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.2.1+build1-0ubuntu0.18.04.2`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.4.0+build2-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.5.1+build2-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.6.1+build2-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.7.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.7.1+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.7.2+build2-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.8.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:60.9.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.2.1+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.2.2+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.4.1+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.7.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.8.0+build2-0ubuntu0.18.04.2`	vulnerable
Ubuntu	thunderbird	18.04	`1:68.10.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:78.8.1+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:78.11.0+build1-0ubuntu0.18.04.2`	vulnerable
Ubuntu	thunderbird	18.04	`1:78.13.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:78.14.0+build1-0ubuntu0.18.04.1`	vulnerable
Ubuntu	thunderbird	18.04	`1:78.14.0+build1-0ubuntu0.18.04.2`	vulnerable
Ubuntu	thunderbird	18.04	`1:91.5.0+build1-0ubuntu0.18.04.1`	fixed
Ubuntu	thunderbird	20.04	`1:68.1.2+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.1.2+build1-0ubuntu2`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.2.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.2.2+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.3.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.3.1+build1-0ubuntu2`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.4.1+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.4.2+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.5.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.6.0+build2-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.7.0+build1-0ubuntu1`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.7.0+build1-0ubuntu2`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.8.0+build2-0ubuntu0.20.04.2`	vulnerable
Ubuntu	thunderbird	20.04	`1:68.10.0+build1-0ubuntu0.20.04.1`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.7.1+build1-0ubuntu0.20.04.1`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.8.1+build1-0ubuntu0.20.04.1`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.11.0+build1-0ubuntu0.20.04.2`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.13.0+build1-0ubuntu0.20.04.2`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.14.0+build1-0ubuntu0.20.04.1`	vulnerable
Ubuntu	thunderbird	20.04	`1:78.14.0+build1-0ubuntu0.20.04.2`	vulnerable
Ubuntu	thunderbird	20.04	`1:91.5.0+build1-0ubuntu0.20.04.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	thunderbird	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	thunderbird	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Ubuntu	thunderbird	deb	18.04	`1:91.5.0+build1-0ubuntu0.18.04.1`	Not reported	UBUNTU-CVE-2021-38495	Not reported
Ubuntu	thunderbird	deb	20.04	`1:91.5.0+build1-0ubuntu0.20.04.1`	Not reported	UBUNTU-CVE-2021-38495	Not reported

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[thunderbird]Unknown
Details (4)
- 1:140.12.0esr-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-af]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-all]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-ar]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-ast]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-be]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-bg]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-br]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-ca]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-cak]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-cs]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-cy]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-da]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-de]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-dsb]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-el]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-en-ca]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-en-gb]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-es-ar]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
[thunderbird-l10n-es-es]Unknown
Source package: [thunderbird]
Details (4)
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.12.0esr-1~deb12u1 · all · bookworm
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm
- 1:140.14.0esr-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · thunderbird · debian · bookworm

Next results

Observed: Oct 23, 2026, 6:01:46 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]