Read the docs
TI-2023-04571 Aliases CVE-2023-4966GHSA-2g42-2pwg-93cj

Unauthenticated sensitive information disclosure in Citrix NetScaler ADC

Priority CRITICAL 100Exploited in the wildCWE-119Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Active In CISA KEV since 2023-10-18CISA due date 2023-11-08Known ransomware use
EPSS 0.99999 99th percentileScored 2026-11-07
Fix Fixed NetScaler ADC (Citrix): 8.50, 49.15, 92.19 +2NetScaler Gateway (Citrix): 8.50, 49.15, 92.19

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
CitrixNetScaler ADC14.1 to before 8.50; 13.1 to before 49.15; 13.0 to before 92.19; 13.1-FIPS to before 37.164; 12.1-FIPS to before 55.300; 12.1-NDcPP to before 55.3008.50, 49.15, 92.19, 37.164, 55.300Patch availableCNA
CitrixNetScaler Gateway14.1 to before 8.50; 13.1 to before 49.15; 13.0 to before 92.198.50, 49.15, 92.19Patch availableCNA
  • NetScaler ADC VendorCitrix Affected 14.1 to before 8.50; 13.1 to before 49.15; 13.0 to before 92.19; 13.1-FIPS to before 37.164; 12.1-FIPS to before 55.300; 12.1-NDcPP to before 55.300 Fixed in 8.50, 49.15, 92.19, 37.164, 55.300 Patch available CNA
  • NetScaler Gateway VendorCitrix Affected 14.1 to before 8.50; 13.1 to before 49.15; 13.0 to before 92.19 Fixed in 8.50, 49.15, 92.19 Patch available CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*12.1 to before 12.1-55.300VulnerableCitrix
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:*12.1 to before 12.1-55.300VulnerableCitrix
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*13.0 to before 13.0-92.19VulnerableCitrix
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:*13.1 to before 13.1-37.164VulnerableCitrix
cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:*13.1 to before 13.1-49.15; 14.1 to before 14.1-8.50VulnerableCitrix
cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:*13.0 to before 13.0-92.19; 13.1 to before 13.1-49.15; 14.1 to before 14.1-8.50VulnerableCitrix
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* Versions 12.1 to before 12.1-55.300 Vulnerable ·Citrix
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:ndcpp:*:*:* Versions 12.1 to before 12.1-55.300 Vulnerable ·Citrix
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* Versions 13.0 to before 13.0-92.19 Vulnerable ·Citrix
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:fips:*:*:* Versions 13.1 to before 13.1-37.164 Vulnerable ·Citrix
  • cpe:2.3:a:citrix:netscaler_application_delivery_controller:*:*:*:*:-:*:*:* Versions 13.1 to before 13.1-49.15; 14.1 to before 14.1-8.50 Vulnerable ·Citrix
  • cpe:2.3:a:citrix:netscaler_gateway:*:*:*:*:*:*:*:* Versions 13.0 to before 13.0-92.19; 13.1 to before 13.1-49.15; 14.1 to before 14.1-8.50 Vulnerable ·Citrix

Remediation

  • Fix · CNA NetScaler ADC (Citrix) Fixed in 8.50, 49.15, 92.19, 37.164, 55.300
  • Fix · CNA NetScaler Gateway (Citrix) Fixed in 8.50, 49.15, 92.19

Timeline

  1. 2023-10-18 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2023-4966
  3. 2026-10-03 Alias added: GHSA-2g42-2pwg-93cj

References

Advisory 2

  • TI-2026-60195 Memory overflow vulnerability leading to Remote Code Execution or Denial of Service KEVCVSS 4.0CRITICAL 9.5
  • TI-2026-60194 Improper input validation in Citrix ADC KEVCVSS 4.0CRITICAL 9.5
  • TI-2023-03284 Unauthenticated remote code execution in Citrix NetScaler ADC KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-15872 NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490 KEVCVSS 4.0CRITICAL 9.3
  • TI-2026-02639 Insufficient input validation leading to memory overread KEVCVSS 4.0CRITICAL 9.3
  • TI-2025-07100 Memory corruption in Citrix ADC KEVCVSS 4.0CRITICAL 9.2
See all 39 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences