CVE-2025-9187

critical · 9.8

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 was fixed in Firefox 142 and Thunderbird 142.

9.8

CVSS

0.4%

EPSS (exploit prob.)

39th

EPSS percentile

2025-08-19

Published

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

Weaknesses

CWE-119

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 142.0
mozilla	thunderbird	< 142.0

Check a specific version with /api/v1/cve/match.

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1825621%2C1970079%2C1976736%2C1979072
https://www.mozilla.org/security/advisories/mfsa2025-64/
https://www.mozilla.org/security/advisories/mfsa2025-70/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-9187