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Debian 11: Thunderbird Critical Code Execution Fix DLA-4405-1

debian lts
Calendar Grey December 13, 2025
Scroller Debian Lts
Critical security issues in Thunderbird fixed in Debian 11 bullseye. Upgrade recommended to prevent arbitrary code execution.
Multiple security issues were discovered in Thunderbird, which could result in the execution of arbitrary code
Topics%20covered

Topics Covered

security advisory critical remote code execution debian update information thunderbird

Summary

For Debian 11 bullseye, these problems have been fixed in version
1:140.6.0esr-1~deb11u1.

We recommend that you upgrade your thunderbird packages.

For the detailed security status of thunderbird please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/thunderbird

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
critical
Lowest
Low
Medium
High
Critical

Package: thunderbird
Version: 1:140.6.0esr-1~deb11u1
CVE ID: CVE-2025-14321 CVE-2025-14322 CVE-2025-14323 CVE-2025-14324

Topics%20covered

Topics Covered

security advisory critical remote code execution debian update information thunderbird

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