Buffer overflow in Citrix Netscaler ADC and Citrix NetScaler Gateway - CVE-2026-88772
Published: September 28, 2026
Vulnerability identifier: #VU152292
CSH Severity: Critical
CVSS v4: 9.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H]
CVE-ID: CVE-2026-88772
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 execute arbitrary code or cause a denial of service.
The vulnerability exists due to a memory overflow in DTLS-enabled virtual servers when processing DTLS traffic. A remote attacker can send crafted input to execute arbitrary code or cause a denial of service.
DTLS must be enabled; it is enabled by default on VPN virtual servers.
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-2026-88772
Install security update from vendor's website.
Citrix Netscaler ADC - addressed in versions 13.1-37.279, 13.1-64.23, 14.1-73.37
Citrix NetScaler Gateway - addressed in versions 13.1-64.23, 14.1-73.37
Citrix NetScaler Gateway - addressed in versions 13.1-64.23, 14.1-73.37
External References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096
- https://support.citrix.com/support-home/topic-article-list?trendingCategory=20&trendingTopicName=Security%20Bulletin
- https://community.citrix.com/techzone-blogs/110_security-updates/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve-2026-88771-through-cve-2026-88778/