What’s Vulnerable › Vulnerabilities

CVE-2021-29950

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-06-24 · updated 2026-06-17
• Weakness: CWE-312

Description

Thunderbird unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. This vulnerability affects Thunderbird < 78.8.1.

Affected products

• Mozilla Thunderbird: before 78.8.1 — fixed in 78.8.1

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 78.8.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1673239
• https://www.mozilla.org/security/advisories/mfsa2021-17/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1673239
• https://www.mozilla.org/security/advisories/mfsa2021-17/

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