Buffer overflow in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2023-6549
Published: January 16, 2024 / Updated: January 17, 2024
Vulnerability identifier: #VU85436
CSH Severity: High
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-6549
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error. A remote attacker can send specially crated packets to the system, trigger memory corruption and perform a denial of service (DoS) attack.
Successful exploitation of this vulnerability requires that the device is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAAvirtualserver.
Note, the vulnerability is being actively exploited in the wild.
Affected software
Citrix Netscaler ADC
Citrix NetScaler Gateway
Citrix NetScaler Gateway
How to mitigate CVE-2023-6549
Install updates from vendor's website.
Citrix Netscaler ADC - addressed in versions 12.1-55.302, 13.0-92.21, 13.1-37.176, 13.1-51.15, 14.1-12.35
Citrix NetScaler Gateway - addressed in versions 13.0-92.21, 13.1-51.15, 14.1-12.35
Citrix NetScaler Gateway - addressed in versions 13.0-92.21, 13.1-51.15, 14.1-12.35