CVE-2023-6549
Actively exploited. CVE-2023-6549 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-01-17) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2023-6549 is indexed in Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
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.
CSIRTS triage
- What
- A buffer overflow vulnerability allows for denial-of-service when configured as a Gateway or AAA virtual server.
- Who is affected
- Deployments of Citrix NetScaler ADC and NetScaler Gateway.
- Urgency
- Immediate action is required due to active exploitation and critical severity.
- Action
- Update to the latest version as recommended by Citrix.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2023-6549 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (1)
- criticalexploitedCVE-2023-6549: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerabilitycisa-kev · 2024-01-17
External references
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[](https://www.csirts.com/cve/CVE-2023-6549)