CVE-2021-29957: mozilla thunderbird
Vulnerability summary
CVE-2021-29957 is a medium (CVSS 4.3) vulnerability in mozilla thunderbird. EPSS estimates a 0.94% chance of exploitation in the next 30 days, higher than 60.3% of scored vulnerabilities. 1 public exploit is recorded.
Advisory lineage
Upstream 0 · Downstream 12 · Related 5Timeline
- 24-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.
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
0.94%
Chance of exploitation in the next 30 days
Percentile
60%
Versus all other CVEs
30-day change
0.00 pp
From 0.94% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.mozilla.org)
Maturity: unknown
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Debian1 product
- thunderbird< 1:78.10.2-1
Mozilla1 product
- thunderbird≥ unspecified, < 78.10.2 | < 78.10.2
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
