Vulnerability Monitor

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CVE-2025-5269

Memory safety bug present in Firefox ESR 128.10, and Thunderbird 128.10. This bug showed evidence of memory corruption and we presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 128.11 and Thunderbird < 128.11.

Published

2025-05-27T13:15:22.717

Last Modified

2025-06-11T12:15:28.270

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses

Type: Secondary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mozilla	firefox	< 128.11.0	Yes
Application	mozilla	thunderbird	< 128.11.0	Yes

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1924108 Permissions Required ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-44/ Vendor Advisory ([email protected])
https://www.mozilla.org/security/advisories/mfsa2025-46/ ([email protected])