CVE-2021-29949: mozilla thunderbird Uncontrolled Search Path Element
Vulnerability summary
CVE-2021-29949 is a high (CVSS 7.8) Uncontrolled Search Path Element vulnerability in mozilla thunderbird. EPSS estimates a 0.32% chance of exploitation in the next 30 days, higher than 23% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 8 · Related 2Timeline
- 24-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
When loading the shared library that provides the OTR protocol implementation, Thunderbird will initially attempt to open it using a filename that isn't distributed by Thunderbird. If a computer has already been infected with a malicious library of the alternative filename, and the malicious library has been copied to a directory that is contained in the search path for executable libraries, then Thunderbird will load the incorrect library. This vulnerability affects Thunderbird < 78.9.1.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.32%
Chance of exploitation in the next 30 days
Percentile
23%
Versus all other CVEs
30-day change
0.00 pp
From 0.32% on 20-09-2026
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
