SB2025120949 - Multiple vulnerabilities in Microsoft Exchange Server
Published: December 9, 2025
Security Bulletin ID
SB2025120949
Severity
Medium
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Input validation error (CVE-ID: CVE-2025-64666)
The vulnerability allows a remote user to escalate privileges within the application.
The vulnerability exists due to insufficient validation of user-supplied input. A remote user can send a specially crafted request to the mail server and gain administrator privileges.
2) Spoofing attack (CVE-ID: CVE-2025-64667)
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.
Remediation
Install update from vendor's website.