CVE-2025-1020

critical · 9.8

Memory safety bugs present in Firefox 134 and Thunderbird 134. 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 135 and Thunderbird 135.

9.8

CVSS

0.5%

EPSS (exploit prob.)

44th

EPSS percentile

2025-02-04

Published

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

Weaknesses

CWE-787

Affected products

Vendor	Product	Affected versions
mozilla	firefox	< 135.0
mozilla	thunderbird	>= 131.0, < 135.0

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

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1939063%2C1942169
https://www.mozilla.org/security/advisories/mfsa2025-07/
https://www.mozilla.org/security/advisories/mfsa2025-11/

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2025-1020