CVE-2020-6806

high-risk
Published 2020-03-25

By carefully crafting promise resolutions, it was possible to cause an out-of-bounds read off the end of an array resized during script execution. This could have led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.6, Firefox < 74, Firefox < ESR68.6, and Firefox ESR < 68.6.

Do I need to act?

~
3.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10 High
NETWORK / LOW complexity

Affected Products (6)

Affected Vendors

Mozilla Canonical

References (14)

Third Party Advisory http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseIntern...
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
Third Party Advisory https://usn.ubuntu.com/4328-1/
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-08/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-09/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-10/
Third Party Advisory http://packetstormsecurity.com/files/157524/Firefox-js-ReadableStreamCloseIntern...
Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1612308
Third Party Advisory https://usn.ubuntu.com/4328-1/
Third Party Advisory https://usn.ubuntu.com/4335-1/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-08/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-09/
Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-10/
50
/ 100
high-risk
Severity 30/34 · Critical
Exploitability 7/34 · Low
Exposure 13/34 · Low