SB2025101575 - Improper validation of certificate with host mismatch in FortiOS and FortiProxy
Published: October 15, 2025
Security Bulletin ID
SB2025101575
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper validation of certificate with host mismatch (CVE-ID: CVE-2025-25253)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to improper validation of certificate with host mismatch. An unauthenticated attacker in a man-in-the middle position can intercept and tamper with connections to the ZTNA proxy.
Remediation
Install update from vendor's website.