CVE-2021-29956 Information disclosure in Thunderbird

What is CVE-2021-29956?

CVE-2021-29956 is a medium-severity vulnerability in Mozilla Thunderbird, published on 24 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

OpenPGP secret keys that were imported using Thunderbird version 78.8.1 up to version 78.10.1 were stored unencrypted on the user's local disk. The master password protection was inactive for those keys. Version 78.10.2 will restore the protection mechanism for newly imported keys, and will automatically protect keys that had been imported using affected Thunderbird versions. This vulnerability affects Thunderbird < 78.10.2.

Weakness: CWE-312

Which versions are affected by CVE-2021-29956?

It affects 1 product.

Products include Mozilla Thunderbird.

How do I fix CVE-2021-29956?

Upgrade to a fixed version.

Is CVE-2021-29956 being exploited?

There is no known exploitation of CVE-2021-29956 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-2021-29956, GHSA-vxjm-jch6-9qr5, UBUNTU-CVE-2021-29956.