CVEvulnerability

CVE-2023-4966

7.5 HIGH Known exploited Published 2023-10-10 Modified 2026-07-31 Official page ↗

CISA Known Exploited Vulnerability

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability — Citrix NetScaler ADC and NetScaler Gateway

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.

Added to KEV
2023-10-18
Remediation due
2023-11-08
Ransomware use
Known
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.
Notes
https://www.netscaler.com/blog/news/cve-2023-4966-critical-security-update-now-available-for-netscaler-adc-and-netscaler-gateway/, https://support.citrix.com/article/CTX579459/netscaler-adc-and-netscaler-gateway-security-bulletin-for-cve20234966-and-cve20234967 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4966
Status
Analyzed
Published
2023-10-10
Last modified
2026-07-31
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.4 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses
CWE-119

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.

Affected configurations

• citrix netscaler application delivery controller (>= 12.1 < 12.1-55.300) • citrix netscaler application delivery controller (>= 13.0 < 13.0-92.19) • citrix netscaler application delivery controller (>= 13.1 < 13.1-37.164) • citrix netscaler application delivery controller (>= 13.1 < 13.1-49.15) • citrix netscaler application delivery controller (>= 14.1 < 14.1-8.50) • citrix netscaler gateway (>= 13.0 < 13.0-92.19) • citrix netscaler gateway (>= 13.1 < 13.1-49.15) • citrix netscaler gateway (>= 14.1 < 14.1-8.50)

Related

Weakness · CWE (1)

  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer weakness

References