by Kastro
Paper/Archive/CVE-2025-9187

CVE-2025-9187

Mozilla Firefox — Memory safety bugs fixed in Firefox 142 and Thunderbird 142

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (ADP, NVD agree)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 41.7.417 × 208.3No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory142CNA
Thunderbirdsee advisory142CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/buglist.cgi?bug_id=1825621%2C1970079%2C1976736%2C1979072refmozilla.org/security/advisories/mfsa2025-64refmozilla.org/security/advisories/mfsa2025-70