Out-of-bounds Read in Mozilla Firefox
CVE-2025-4082
Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.*. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Mozilla Firefox — versions 115.23, 128.10, 138
- Mozilla Thunderbird — versions 128.10, 138
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2025-28/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-29/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-30/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-31/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-32/ (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-4082?
- CVE-2025-4082 is a medium-severity vulnerability in Mozilla Firefox, classified under Out-of-bounds Read. CVSS score: 5.9/10. Published 2025-04-29.
- How severe is CVE-2025-4082?
- Medium severity. CVSS v3 base score is 5.9 out of 10.