Integer overflow in Mozilla Firefox
CVE-2025-10533
Integer overflow in the SVG component. This vulnerability was fixed in Firefox 143, Firefox ESR 115.28, Firefox ESR 140.3, Thunderbird 143, and Thunderbird 140.3.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Mozilla Firefox — versions 115.28, 140.3, 143
- Mozilla Thunderbird — versions 140.3, 143
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2025-73/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-74/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-75/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-77/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-78/ (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-10533?
- CVE-2025-10533 is a high-severity vulnerability in Mozilla Firefox, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2025-09-16.
- How severe is CVE-2025-10533?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-10533 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.