CVE-2021-29957 Security feature bypass in Thunderbird
Thunderbird fails to warn users when only parts of a MIME email are protected, potentially leading to security bypass.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-29957?
CVE-2021-29957 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
If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.
Which versions are affected by CVE-2021-29957?
It affects 1 product.
Products include Mozilla Thunderbird.
How do I fix CVE-2021-29957?
Upgrade to a fixed version.
Is CVE-2021-29957 being exploited?
There is no known exploitation of CVE-2021-29957 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Thunderbird
Sources
Also known as DEBIAN-CVE-2021-29957, GHSA-5v9p-7pr9-r9pm, UBUNTU-CVE-2021-29957.