CVE-2025-9187

critical

Description

Memory safety bugs present in Firefox 141 and Thunderbird 141. 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 < 142 and Thunderbird < 142.

References

https://www.securityweek.com/high-severity-vulnerabilities-patched-in-chrome-firefox/

https://www.mozilla.org/security/advisories/mfsa2025-70/

https://www.mozilla.org/security/advisories/mfsa2025-64/

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1825621%2C1970079%2C1976736%2C1979072

Details

Source: Mitre, NVD

Published: 2025-08-19

Updated: 2025-08-20

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.00017