CVE-2020-15659

moderate-risk

Published 2020-08-10

Mozilla developers and community members reported memory safety bugs present in Firefox 78 and Firefox ESR 78.0. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

Do I need to act?

0.93% chance of exploitation

EPSS score — low 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

CVSS 8.8/10 High

NETWORK / LOW complexity

Affected Products (8)

Firefox

Firefox Esr

Thunderbird

Leap

Ubuntu Linux

Affected Vendors

Mozilla Canonical Opensuse

References (20)

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html

Mailing List http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.html

Issue Tracking https://bugzilla.mozilla.org/buglist.cgi?bug_id=1550133%2C1633880%2C1643613%2C16...

Patch https://usn.ubuntu.com/4443-1/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-30/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-31/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-32/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-33/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2020-35/