Spoofing attack in Microsoft Exchange Server - CVE-2025-64667
Published: December 9, 2025
Vulnerability identifier: #VU119435
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-64667
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of user-supplied data. A remote attacker can spoof an 5322.From email address that is displayed to a user.
Affected software
Microsoft Exchange Server
How to mitigate CVE-2025-64667
Install updates from vendor's website.
Microsoft Exchange Server - addressed in versions SE RTM Dec25SU 15.02.2562.035, 2016 CU23 Dec25SU 15.01.2507.063, 2019 CU14 Dec25SU 15.02.1544.037, 2019 CU15 Dec25SU 15.02.1748.042