# CVE-2020-6819: A Mozilla Firefox and Thunderbird bug is being used in attacks

Status: Being used now (CISA KEV, added 2021-11-03)
Who: 
Do this: 

## Agent prompt (read-only)
Read-only check, change nothing, send nothing anywhere.
Is Mozilla Firefox and Thunderbird (CVE-2020-6819) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2020-6819. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.

## Official description
Mozilla Firefox and Thunderbird contain a race condition vulnerability when running the nsDocShell destructor under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

## Sources
- https://nvd.nist.gov/vuln/detail/CVE-2020-6819
- https://nvd.nist.gov/vuln/detail/CVE-2020-6819

Generated by isitexploited.org from public sources. Verify version numbers against the vendor before acting.