CVE-2023-4966

Name: CVE-2023-4966
Creator: NVD / NIST
Published: 2023-10-10T14:15:10.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 100.00%

Last modified Jun 17, 2026

CVE-2023-4966 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 100.00% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

100.00%

100.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Nov 8, 2023.

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
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

References

http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
https://support.citrix.com/article/CTX579459Vendor Advisory
http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.htmlThird Party Advisory, VDB Entry
https://support.citrix.com/article/CTX579459Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4966US Government Resource

Timeline

Published: Oct 10, 2023
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2023-4966?

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.

How severe is CVE-2023-4966?

CVE-2023-4966 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 100.00% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2023-4966?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4966?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST