Vulnerability · Published Jun 24, 2021 · Assigned by mozilla

CVE-2021-23992

Medium 4.3

In plain English

A medium-severity security flaw in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)4.3Medium

Exploit odds (30 days)0.5%top 58.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Thunderbird did not check if the user ID associated with an OpenPGP key has a valid self signature. An attacker may create a crafted version of an OpenPGP key, by either replacing the original user ID, or by adding another user ID. If Thunderbird imports and accepts the crafted key, the Thunderbird user may falsely conclude that the false user ID belongs to the correspondent. This vulnerability affects Thunderbird < 78.9.1.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	thunderbird	1:78.10.0-1	DEBIAN-CVE-2021-23992
Debian:13	thunderbird	1:78.10.0-1	DEBIAN-CVE-2021-23992
Debian:14	thunderbird	1:78.10.0-1	DEBIAN-CVE-2021-23992

Affected products (as reported)

Vendor	Product	Versions
Mozilla	Thunderbird	unspecified – before 78.9.1

References

https://www.mozilla.org/security/advisories/mfsa2021-13/ x_refsource_MISC
https://bugzilla.mozilla.org/show_bug.cgi?id=1666236 x_refsource_MISC