CVE-2023-6549
Citrix NetScaler ADC and NetScaler Gateway
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
What it is
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.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- support.citrix.com/article/CTX584986/netscaler-adc-and-netscaler-gateway-security-bulletin
- nvd.nist.gov/vuln/detail/CVE-2023-6549
Description and required action as published by CISA. Full record at NVD.
Other Citrix entries on the list
- NetScaler Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-88779 · Oct 4, 2026
- NetScaler Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-88772 · Sep 27, 2026
- NetScaler Citrix NetScaler Improper Input Validation Vulnerability CVE-2026-88771 · Sep 27, 2026
- NetScaler Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability CVE-2026-19490 · Sep 9, 2026
- NetScaler ADC and NetScaler Gateway Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability CVE-2026-8452 · Aug 26, 2026
- NetScaler Citrix NetScaler Out-of-Bounds Read Vulnerability CVE-2026-3055 · Mar 30, 2026