Buffer Over-read in Mozilla products - CVE-2025-8027
Published: July 22, 2025
Vulnerability identifier: #VU113137
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2025-8027
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Firefox ESR
Firefox for Android
Mozilla Firefox
Firefox ESR
Firefox for Android
Detailed vulnerability description
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists on 64-bit systems due to IonMonkey-JIT JavaScript engine write only 32 bits of the 64-bit return value space on the stack, however read the entire 64 bits. A remote attacker can trick the victim into visiting a specially crafted website and execute arbitrary code on the system.
How to mitigate CVE-2025-8027
Install updates from vendor's website.
Sources
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-57/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-58/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-59/
- https://www.mozilla.org/en-US/security/advisories/mfsa2025-56/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1968423