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Mozilla Firefox And Thunderbird Use-After-Free Vulnerability

High Listed in CISA KEV
CVECVE-2020-6820
First seen2021-11-03 00:00 UTC
Disclosed2021-11-03 00:00 UTC
Last updated2026-07-18 08:00 UTC
Channel statuspending_review

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.

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • Mozilla:Firefox and Thunderbird

Sources

  • CISA KEV DATABASE

Original Links

Timeline

  1. kev_added CISA KEV
  2. kev_ingest CISA KEV