CVE-2023-4966
Actively exploited. CVE-2023-4966 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-10-18) — 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-2023-4966 is indexed in Metasploit, GitHub PoC and Nuclei. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
[Update on November 22, 2023] The vendor published a document [3] on November 20, 2023, listing the various logs to analyze as well as the items to look for to identify activity that may be related to a compromise. Additionally, CISA published a security advisory on the 21...
CSIRTS triage
- What
- A vulnerability exists in Citrix NetScaler ADC and NetScaler Gateway.
- Who is affected
- Deployments of Citrix NetScaler ADC and NetScaler Gateway are affected.
- Urgency
- Remediation is urgent as the vulnerability has been exploited.
- Action
- Follow the vendor's guidance for mitigation and monitoring.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2023-4966
Get an email if CVE-2023-4966 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 100% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2023-4966 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- MetasploitA Metasploit Framework module targets this CVE — weaponized, point-and-click exploitation.look it up ↗
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
- NucleiA nuclei-templates detection/PoC template exists for this CVE.look it up ↗
Advisory coverage (2)
- unknown[Update] Vulnerability in Citrix NetScaler ADC and NetScaler Gateway (October 23, 2023)cert-fr-alerte · 2023-10-23
- criticalexploitedCVE-2023-4966: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerabilitycisa-kev · 2023-10-18
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2023-4966)