Citrix NetScaler ADC and NetScaler Gateway: 2 actively exploited vulnerabilities

CVE-2023-6548: Citrix NetScaler ADC and NetScaler Gateway contain a code injection vulnerability that allows for authenticated remote code execution on the management interface with access to NSIP, CLIP, or SNIP. CVE-2023-6549: 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. Added to the CISA KEV catalog on 2024-01-17. CVE-2023-6548, CVE-2023-6549 were assigned before 2024; the KEV listing came in 2024.

Why this severity: CVSS 8.2 (v3.1, CNA), actively exploited (CISA KEV)

Started

Jan 17, 2024

Closed

Jan 17, 2024

CVEs

CVE-2023-6548CVE-2023-6549

• Citrix
• NetScaler
• CISA KEV
• RCE

Notes & caveats

Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).