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
CSH Severity: High
CVSS v4: 9.3 [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]
CVE-ID: CVE-2025-5777
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
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.
Affected software
Citrix Netscaler ADC
Citrix NetScaler Gateway
Citrix NetScaler Gateway
How to mitigate CVE-2025-5777
Install updates from vendor's website.
Citrix Netscaler ADC - addressed in versions 12.1-55.328, 13.1-37.235, 13.1-58.32, 14.1-43.56
Citrix NetScaler Gateway - addressed in versions 13.1-58.32, 14.1-43.56
Citrix NetScaler Gateway - addressed in versions 13.1-58.32, 14.1-43.56
Links to Public Exploits and PoC-codes
- Exploit #12052 - CVE-2025-5777-CitrixBleed (October 31, 2025)
- Exploit #12019 - CVE-2025-5777 (October 8, 2025)
- Exploit #11843 - CVE-2025-5777-TrendMicro-ApexCentral-RCE (August 8, 2025)
- Exploit #11840 - CVE-2025-5777-Exploit (August 8, 2025)
- Exploit #11818 - CVE-2025-5777 (August 1, 2025)
- Exploit #11792 - ExploitVeer (An advanced, powerful, and easy-to-use tool designed to detect and exploit CVE-2025-5777 (CitrixBleed 2). This script not only identifies the vulnerability but also helps in demonstrating its impact by parsing human-readable information from (July 18, 2025)
- Exploit #11787 - CVE-2025-5777 (July 18, 2025)
- Exploit #11735 - CitrixBleed-2-CVE-2025-5777-PoC- (July 3, 2025)