by Kastro
Paper/Archive/CVE-2025-11721

CVE-2025-11721

Mozilla Firefox — Memory safety bug fixed in Firefox 144 and Thunderbird 144

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
36
CVSS 9.8 (ADP, NVD agree)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 30.3.303 × 206.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Memory safety bug present in Firefox 143 and Thunderbird 143. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 144 and Thunderbird 144.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory144CNA
Thunderbirdsee advisory144CNA

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: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1986816refmozilla.org/security/advisories/mfsa2025-81refmozilla.org/security/advisories/mfsa2025-84