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CVE-2023-4966

CRITICAL
9.4 RansomwareNVD

Summary

generated automatically from NVD data

CVE-2023-4966 is a sensitive information disclosure flaw in NetScaler ADC and NetScaler Gateway, affecting appliances configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or as an AAA virtual server. It is associated with CWE-119 and carries a CVSS v3.1 score of 9.4 (CRITICAL), reachable over the network without authentication or user interaction. The CISA KEV catalog lists it as actively exploited, with known use in ransomware campaigns.

NVD description

Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA  virtual server.

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⚠️ Actively exploited — CISA KEV

This CVE was added to CISA's Known Exploited Vulnerabilities catalog on 2023-10-18. It is confirmed exploited in the wild and must be patched as a priority.

Remediation deadline (US federal agencies): 2023-11-08

Used in known ransomware campaigns.

EPSS · FIRST.org

100.0%probability of exploitation in the next 30 days

Higher than 99% of scored CVEs

EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.

In-depth analysis on cveo.tech

We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.

CVSS v3.1 Score

9.4
/ 10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Information

Published
10 oct. 2023
Updated
31 juil. 2026
Status
Analyzed
Source
secure@citrix.com

Affected products

citrix netscaler application delivery controller
Versions : 12.1-55.300, 13.0-92.19, 13.1-37.164, 13.1-49.15, 14.1-8.50
citrix netscaler gateway
Versions : 13.0-92.19, 13.1-49.15, 14.1-8.50

Weaknesses (CWE)

CWE-119NVD-CWE-noinfo

References (5)

Similar CVEs

Other vulnerabilities of type CWE-119

…

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