CVE-2021-29950: Mozilla Thunderbird

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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)

Published 2021-06-24. Last modified 2026-06-17.