#VU111237 Out-of-bounds read in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2025-5777
Published: June 17, 2025 / Updated: October 31, 2025
Vulnerability identifier: #VU111237
Vulnerability risk: High
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber
CVE-ID: CVE-2025-5777
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerable software:
Citrix Netscaler ADC
Citrix NetScaler Gateway
Citrix Netscaler ADC
Citrix NetScaler Gateway
Software vendor:
Citrix
Citrix
Description
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to a boundary condition. A remote attacker can send specially crafted data to the server, trigger an out-of-bounds read error and read contents of memory on the system.
Successful exploitation of the vulnerability requires that NetScaler is configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server.
Remediation
Install updates from vendor's website.