CVE-2021-38495 Memory corruption in Firefox ESR
Memory safety bugs in Thunderbird allow attackers to potentially execute arbitrary code via crafted content.
- 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-2021-38495?
CVE-2021-38495 is a high-severity memory corruption vulnerability in Mozilla Firefox Esr, published on 3 Nov 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
Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 91.1 and Firefox ESR < 91.1.
Weakness: CWE-787
Which versions are affected by CVE-2021-38495?
It affects 2 products.
Products include Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2021-38495?
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-2021-38495 being exploited?
There is no known exploitation of CVE-2021-38495 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox Esr
Sources
Also known as GHSA-whqc-prwr-5mvr, UBUNTU-CVE-2021-38495.