CVE-2021-29950 Information disclosure in Thunderbird

What is CVE-2021-29950?

CVE-2021-29950 is a high-severity vulnerability in Mozilla Thunderbird, published on 24 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-312

Which versions are affected by CVE-2021-29950?

It affects 1 product.

Products include Mozilla Thunderbird.

How do I fix CVE-2021-29950?

Upgrade to a fixed version.

Is CVE-2021-29950 being exploited?

There is no known exploitation of CVE-2021-29950 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Thunderbird

• CVE-2026-92238 Ambiguous parsing of mail headers Critical 9.8
• CVE-2026-84637 Calendar invitation attachments could launch local executables Critical 9.8
• CVE-2021-43529 Memory corruption in Thunderbird Critical 9.8
• CVE-2019-11703 Memory corruption in Thunderbird Critical 9.8
• CVE-2019-11704 Memory corruption in Thunderbird Critical 9.8

All Mozilla Thunderbird vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2021-29950, GHSA-4ghf-pq62-2jfh, UBUNTU-CVE-2021-29950.