SB2025062606 - Remote denial of service in NetScaler Gateway and NetScaler ADC
Published: June 26, 2025
Security Bulletin ID
SB2025062606
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Buffer overflow (CVE-ID: CVE-2025-6543)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error when handling incoming requests. A remote attacker can send specially crafted traffic to the server, trigger memory corruption and perform a denial of service (DoS) attack.
Successful exploitation of the vulnerability requires that NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.