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CVE-2025-4087: A vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due to missing null checks during attribute access....

6.5 CVSS

Description

A vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird ESR < 128.10.

Classification

CVE ID: CVE-2025-4087

CVSS Base Severity: MEDIUM

CVSS Base Score: 6.5

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Problem Types

Unsafe attribute access during XPath parsing

Affected Products

Vendor: Mozilla

Product: Firefox, Firefox ESR, Thunderbird, Thunderbird ESR

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.08% (probability of being exploited)

EPSS Percentile: 23.46% (scored less or equal to compared to others)

EPSS Date: 2025-05-28 (when was this score calculated)

References

https://nvd.nist.gov/vuln/detail/CVE-2025-4087
https://bugzilla.mozilla.org/show_bug.cgi?id=1952465
https://www.mozilla.org/security/advisories/mfsa2025-28/
https://www.mozilla.org/security/advisories/mfsa2025-29/
https://www.mozilla.org/security/advisories/mfsa2025-31/
https://www.mozilla.org/security/advisories/mfsa2025-32/

Timeline