Risk Letters

Exploited vulnerability

CVE-2020-6819

TLP:CLEAR

Mozilla Firefox And Thunderbird Use-After-Free Vulnerability

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.

Facts

  • Vendor: Mozilla
  • Product: Firefox and Thunderbird
  • CVSS: 8.1
  • EPSS (probability of exploitation within 30 days): 3 %
  • On CISA's Known Exploited Vulnerabilities list since: 3 November 2021
  • First known exploitation: 3 November 2021
  • CISA's deadline for US federal agencies: 3 May 2022
  • Weakness: CWE-362
  • First seen by Risk Letters: 3 November 2021

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD