NetScaler ADC and Gateway
CVE-2023-4966: Unauthenticated sensitive information disclosure
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.
Published
ExploitedYes, in CISA KEVAdded 18 Oct 2023
Ransomware useKnownPer CISA
SeverityCRITICALCVSS 3.1 9.4
EPSS100%Chance of exploitation in 30 days
Public exploitNot tracked
FixAvailable
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| NetScaler ADC 14.1 | 8.50 or later |
| NetScaler ADC 13.1 | 49.15 or later |
| NetScaler ADC 13.0 | 92.19 or later |
| NetScaler ADC 13.1-FIPS | 37.164 or later |
| NetScaler ADC 12.1-FIPS | 55.300 or later |
| NetScaler ADC 12.1-NDcPP | 55.300 or later |
| NetScaler Gateway 14.1 | 8.50 or later |
| NetScaler Gateway 13.1 | 49.15 or later |
| NetScaler Gateway 13.0 | 92.19 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
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.
Exploitation
CISA lists this CVE as exploited in the wild since 18 Oct 2023, including in ransomware campaigns.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.