Vulnerability Monitor

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CVE-2025-4919

An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability affects Firefox < 138.0.4, Firefox ESR < 128.10.1, Firefox ESR < 115.23.1, Thunderbird < 128.10.2, and Thunderbird < 138.0.2.

Published

2025-05-17T22:15:19.653

Last Modified

2025-05-28T14:08:29.293

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 8.8 (HIGH)

Weaknesses

Type: Secondary
CWE-125
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 115.23.1	Yes
Application	mozilla	firefox	< 138.0.4	Yes
Application	mozilla	firefox	< 128.10.1	Yes
Application	mozilla	thunderbird	< 128.10.2	Yes
Application	mozilla	thunderbird	< 138.0.2	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1966614 Permissions Required ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-36/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-37/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-38/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-40/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-41/ Vendor Advisory ([email protected])