CVE-2020-12396
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.68%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Mozilla developers and community members reported memory safety bugs present in Firefox 75. 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 < 76.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.68% probability · 77th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 1.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1339601%2C1611938%2C1620488%2C1622291%2C1627644Broken Link, Issue Tracking
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1339601%2C1611938%2C1620488%2C1622291%2C1627644Broken Link, Issue Tracking
- https://security.gentoo.org/glsa/202005-04Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-16/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.