What is CVE-2023-25737?

CVE-2023-25737 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Type Conversion or Cast. CVSS score: 8.8/10. Published 2023-06-02.

How severe is CVE-2023-25737?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Mozilla Firefox

CVE-2023-25737

An invalid downcast from <code>nsTextNode</code> to <code>SVGElement</code> could have lead to undefined behavior. This vulnerability affects Firefox < 110, Thunderbird < 102.8, and Firefox ESR < 102.8.

Published 2023-06-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.5th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.5% 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 unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Firefox Esr
Mozilla Thunderbird — versions unspecified

Weakness classification (CWE)

CWE-704 — Incorrect Type Conversion or Cast

References

www.mozilla.org/security/advisories/mfsa2023-06/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2023-05/ (Vendor Advisory)
www.mozilla.org/security/advisories/mfsa2023-07/ (Vendor Advisory)
bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)

Frequently asked questions

What is CVE-2023-25737?: CVE-2023-25737 is a high-severity vulnerability in Mozilla Firefox, classified under Incorrect Type Conversion or Cast. CVSS score: 8.8/10. Published 2023-06-02.
How severe is CVE-2023-25737?: High severity. CVSS v3 base score is 8.8 out of 10.