CVE-2023-4966: Unauthenticated sensitive information disclosure

Published Oct 10, 2023
·
Updated

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.

Other sources

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.

NVD

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 Software

10 affected components
Citrix NetScaler ADC and NetScaler Gateway
Citrix NetScaler Application Delivery Controller>=12.1<12.1-55.300
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

Event History

Oct 10, 2023
CVE Published
via MITRE·01:12 PM
Data Sourced
via MITRE·01:12 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·02:15 PM
DescriptionSeverityWeaknessAffected Software
Oct 18, 2023
Known Exploited
via CISA·12:00 AM
Known Ransomware
via CISA·12:00 AM
Nov 10, 2023
News Published
08:00 AM
Nov 17, 2023
News Published
11:26 PM
Nov 21, 2023
News Published
04:36 PM
Nov 23, 2023
News Published
06:01 PM
Dec 2, 2023
News Published
03:09 PM
Dec 15, 2023
News Published
05:30 PM
Dec 19, 2023
News Published
12:03 AM
Jan 16, 2024
News Published
via BleepingComputer·08:33 PM
Jan 20, 2024
News Published
via BleepingComputer·08:36 PM
Apr 21, 2024
News Published
via BleepingComputer·02:21 PM
May 9, 2024
News Published
via BleepingComputer·07:27 PM
Sep 27, 2024
News Published
via BleepingComputer·03:09 PM
Apr 3, 2025
News Published
via The Register·07:14 PM
News Published
via The Register·07:18 PM
Jun 24, 2025
News Published
via The Register·09:01 PM
Jun 25, 2025
News Published
via BleepingComputer·04:10 PM
News Published
via The Register·09:10 PM
Jun 27, 2025
News Published
via BleepingComputer·02:18 PM
Jul 7, 2025
News Published
via BleepingComputer·10:57 PM
Jul 10, 2025
News Published
via The Register·10:13 PM
Jul 11, 2025
News Published
via BleepingComputer·02:45 PM
Aug 12, 2025
News Published
via The Register·04:45 PM
Aug 28, 2025
News Published
via The Register·01:17 PM
Mar 25, 2026
News Published
via BleepingComputer·03:52 PM

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is CVE-2023-4966?

CVE-2023-4966 is a buffer overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway that allows for sensitive information disclosure when configured as a Gateway or AAA virtual server.

2

What software is affected by CVE-2023-4966?

Citrix NetScaler ADC and NetScaler Gateway versions 12.1-55.300 to 14.1-8.50 are affected by CVE-2023-4966.

3

What is the severity of CVE-2023-4966?

CVE-2023-4966 has a severity rating of 7.5 (Critical).

4

How can I fix CVE-2023-4966?

Citrix has released security bulletins and patches for CVE-2023-4966. It is recommended to apply the relevant patches or updates provided by Citrix.

5

Where can I find more information about CVE-2023-4966?

You can find more information about CVE-2023-4966 on the official Citrix support website: https://support.citrix.com/article/CTX579459

Contact

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