January 17, 2024 · Applied Cybernetics Group
CVE-2023-6549 — Citrix NetScaler ADC and NetScaler Gateway
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
- Added to KEV
2024-01-17- Federal due date
2024-02-07- Vendor
- Citrix
- Product
- NetScaler ADC and NetScaler Gateway
- EPSS
- 99.0th percentile (score 0.576, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- ATT&CK
- T1499 , T1574 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-6549
CISA short 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
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.