Vulnerability Monitor

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CVE-2025-4091

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird < 128.10.

Published

2025-04-29T14:15:35.717

Last Modified

2025-05-09T19:32:09.470

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses

Type: Secondary
CWE-119

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 128.10	Yes
Application	mozilla	firefox	< 138.0	Yes
Application	mozilla	thunderbird	< 128.10.0	Yes
Application	mozilla	thunderbird	< 138.0	Yes

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1951161%2C1952105 Broken Link ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-28/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-29/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-31/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-32/ Vendor Advisory ([email protected])