Is CVE-2023-4966 actively exploited?

Yes. CVE-2023-4966 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2023-4966 be exploited remotely?

The attack vector of CVE-2023-4966 has not been classified yet.

What is the CVSS score of CVE-2023-4966?

CVE-2023-4966 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2023-4966

HIGHCISA KEVIN THE WILD

CVE-2023-4966

Published: October 18, 2023

EPSS:94.35%probability of exploitation in 30 daysPercentile:100.0th

Official Description

Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for sensitive information disclosure when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.

NVD Source

CISA KEV Advisory

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to KEV: 2023-10-18Federal patch deadline: 2023-11-08⚠ USED IN RANSOMWARE CAMPAIGNS

Required Action (CISA)

Apply mitigations and kill all active and persistent sessions per vendor instructions [https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/] OR discontinue use of the product if mitigations are unavailable.

Risk Analysis

Citrix NetScaler ADC and NetScaler Gateway have a buffer overflow vulnerability that can lead to sensitive information disclosure. This occurs when configured as a Gateway or AAA virtual server. The high EPSS score of 0.94348 indicates a very high likelihood of exploitation.

This vulnerability is actively exploited in the wild and is listed in CISA's KEV catalog. The flaw can be exploited remotely to disclose sensitive information.

Recommended Action

Apply the latest security updates for Citrix NetScaler ADC and NetScaler Gateway, especially if configured as a Gateway or AAA virtual server, to prevent sensitive information disclosure.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-4966 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2023-4966 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.