CVE-2020-6820

moderate-risk
Published 2020-04-24

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.

Do I need to act?

~
3.1% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.1/10 High
NETWORK / HIGH complexity

Affected Products (3)

Affected Vendors

Mozilla

References (9)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-11/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-14/
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1626728
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-11/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-14/
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-...
46
/ 100
moderate-risk
Severity 24/34 · High
Exploitability 13/34 · Low
Exposure 9/34 · Low