CVE-2021-43529 Memory corruption in Thunderbird
Heap overflow in Thunderbird when processing S/MIME messages allows attackers to execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-43529?
CVE-2021-43529 is a critical memory corruption vulnerability in Mozilla Thunderbird, published on 16 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.
Weakness: CWE-787
Which versions are affected by CVE-2021-43529?
It affects 1 product.
Products include Mozilla Thunderbird.
How do I fix CVE-2021-43529?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-43529 being exploited?
There is no known exploitation of CVE-2021-43529 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Thunderbird
Sources
Also known as DEBIAN-CVE-2021-43529, GHSA-82q7-2fg2-4gcj, UBUNTU-CVE-2021-43529.