CVE-2020-6820

Summary

Under certain conditions, when handling a ReadableStream, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

Affected Software

Weaknesses

• Use-after-free when handling a ReadableStream

ADP Enrichment

CVE Program Container

Additional References

• https://www.mozilla.org/security/advisories/mfsa2020-14/
• https://www.mozilla.org/security/advisories/mfsa2020-11/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
• https://usn.ubuntu.com/4335-1/

CISA ADP Vulnrichment

• SSVC:
• Exploitation: active
  • Automatable: no
  • Technical Impact: total

Additional References

• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-6820

References

• https://www.mozilla.org/security/advisories/mfsa2020-14/
• https://www.mozilla.org/security/advisories/mfsa2020-11/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
• https://usn.ubuntu.com/4335-1/

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