Citrix NetScaler ADC and NetScaler Gateway
YES - ON THE CISA KEV LIST
CVE-2023-6549
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
overdue since 2024-02-07
Citrix: 27 entries (1.5% of all KEV entries are from this vendor); 6 added in 2026.
BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.
Your BOD 26-04 window (SSVC tier helper)
Your remediation window ends:
Description
Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
Required action (CISA)
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes
https://support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20236548-and-cve20236549; https://nvd.nist.gov/vuln/detail/CVE-2023-6549
References
Other KEV entries for this vendor: Citrix
- CVE-2026-88779 - NetScaler (2026-10-04)
- CVE-2026-88772 - NetScaler (2026-09-27)
- CVE-2026-88771 - NetScaler (2026-09-27)
- CVE-2026-19490 - NetScaler (2026-09-09)
- CVE-2026-8452 - NetScaler ADC and NetScaler Gateway (2026-08-26)
- CVE-2026-3055 - NetScaler (2026-03-30)
- CVE-2025-7775 - NetScaler (2025-08-26)
- CVE-2024-8068 - Session Recording (2025-08-25)
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