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VulnerabilityKnown exploited · ransomwareExploit likelihood 100%
Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
CVE-2023-4966 · CISA KEV · October 18, 2023
Summary
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.
From CISA, quoted as published. Check the source before acting.
What to do
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.
CISA required action, quoted.
Affected products
| Vendor | Product |
|---|---|
| Citrix | NetScaler ADC and NetScaler Gateway |
Why it's on these mode pages
- Maritime: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
- Pipeline: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
- Freight rail: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
- Passenger rail and transit: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
- Highway and motor carrier: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
- Postal and parcel: Vendor table: Citrix (network and remote-access gear used in every mode, all modes) (matched by rule)
Change history
- November 9, 2026: First collected by Watch
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