CVE-2021-23992: mozilla thunderbird
Vulnerability summary
CVE-2021-23992 is a medium (CVSS 4.3) vulnerability in mozilla thunderbird. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.9% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 11 · Related 4Timeline
- 24-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
- OSV · DebianEcosystem advisory · calculated4.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.48%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
0.00 pp
From 0.48% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- thunderbird< 1:78.10.0-1
Mozilla1 product
- thunderbird≥ unspecified, < 78.9.1 | < 78.9.1
Ubuntu1 product
- thunderbird< 1:78.11.0+build1-0ubuntu0.18.04.2 | < 1:78.11.0+build1-0ubuntu0.20.04.2
3 vendors · 3 products
References
8 links- bugzilla.mozilla.org/show_bug.cgi?id=1666236X Refsource MISCIssue TrackingPermissions RequiredVendor Advisory
