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CVE-2023-4966

Unauthenticated sensitive information disclosure

Published: Oct 10, 2023Updated: Oct 24, 2025 Sources: CVE List NVD BDUCWE-119
9.4CRITICAL
NVD MITRE
EPSS Score
100.0%
Top 0.0%
CISA KEV
Active Exploitation
Since Oct 18, 2023
Exploits
1 Known
Remediation
Patch Available
Self-Check
Nuclei · OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-119NVD-CWE-noinfo

Affected Products

Citrix
commercial·USaka application delivery controller firmware, xenserver, netscaler gateway firmware
netscaler application delivery controllerOn-premNetwork Device
Networking Infrastructure / load-balancer-proxy
NetScaler GatewayOn-premSecurity Product
Networking Infrastructure
NetScaler ADCMixed
Cloud & SaaS / virtualization
Citrix Systems Inc.
commercial·USaka netscaler gateway, citrix gateway, citrix adc
Citrix ADCSaaSSaaS Service
Cloud & SaaS / api-gateway
Citrix GatewayOn-premNetwork Device
Networking Infrastructure
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Oct 18, 2023
Remediation due:Nov 8, 2023
Ransomware:Known ransomware use

Required action: 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.

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html
packetstormsecurity.com
https://support.citrix.com/article/CTX579459
support.citrix.com
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4966
cisa.gov
and 2 more references View all →
News mentions
2

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