UNKNOWNKNOWN EXPLOITED

CVE-2020-6820

Mozilla Firefox And Thunderbird Use-After-Free Vulnerability

Published: 2021-11-03
Modified: 2026-07-31
Sources: cisa-kev

Summary

Mozilla Firefox and Thunderbird contain a race condition vulnerability when handling a ReadableStream under certain conditions. The race condition creates a use-after-free vulnerability, causing unspecified impacts.

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Includes data from the CISA Known Exploited Vulnerabilities catalog.

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