by Kastro
Paper/Archive/CVE-2025-2857

CVE-2025-2857

Mozilla Firefox — Incorrect handle could lead to sandbox escapes

EPSS 2%CVSS 10.0
critical.is priorityof 100
46
CVSS 10.0 (ADP)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 80.5.805 × 2016.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory115.21.1CNA

Scores by source

CISA ADP10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=1956398refissues.chromium.org/issues/405143032refcve.org/CVERecord?id=CVE-2025-2783refmozilla.org/security/advisories/mfsa2025-19