CVE-2023-4966: Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
First published: Tue 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.
Credit: secure@citrix.com secure@citrix.com secure@citrix.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 | |
| Citrix NetScaler ADC | ||
| Citrix NetScaler Gateway | ||
| Citrix NetScaler ADC and NetScaler Gateway | ||
| >=12.1<12.1-55.300 | ||
| >=12.1<12.1-55.300 | ||
| >=13.0<13.0-92.19 | ||
| >=13.1<13.1-37.164 | ||
| >=13.1<13.1-49.15 | ||
| >=14.1<14.1-8.50 | ||
| >=13.0<13.0-92.19 | ||
| >=13.1<13.1-49.15 | ||
| >=14.1<14.1-8.50 |
Remedy
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.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://support.citrix.com/article/CTX579459
- https://www.bleepingcomputer.com/news/security/citrix-warns-of-new-netscaler-zero-days-exploited-in-attacks/
- https://www.bleepingcomputer.com/news/security/ransomware-payments-drop-to-record-low-of-28-percent-in-q1-2024/
- https://www.bleepingcomputer.com/news/security/citrix-warns-admins-to-manually-mitigate-putty-ssh-client-bug/
- http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html
- 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
- https://www.bleepingcomputer.com/news/security/embargo-ransomware-escalates-attacks-to-cloud-environments/
Frequently Asked Questions
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.
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.
What is the severity of CVE-2023-4966?
CVE-2023-4966 has a severity rating of 7.5 (Critical).
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.
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
- collector/nvd-index
- agent/type
- agent/first-publish-date
- agent/remedy
- agent/title
- agent/description
- agent/weakness
- collector/bleeping-computer
- source/BleepingComputer
- alias/CVE-2023-6548
- alias/CVE-2023-6549
- alias/CVE-2023-4966
- agent/severity
- zeroday/true
- agent/news-ai
- agent/software-canonical-lookup
- alias/CVE-2023-20269
- alias/CVE-2024-1708
- alias/CVE-2024-31497
- collector/mitre-cve
- source/MITRE
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- exploited/true
- ransomware/true
- collector/cisa-known-exploited
- source/CISA
- agent/references
- agent/softwarecombine
- agent/event
- collector/nvd-cve
- agent/author
- agent/tags
- alias/CVE-2022-47966
- alias/CVE-2023-29300
- alias/CVE-2023-38203
- vendor/citrix
- canonical/citrix netscaler application delivery controller
- version/citrix netscaler application delivery controller/12.1
- version/citrix netscaler application delivery controller/13.0
- version/citrix netscaler application delivery controller/13.1
- version/citrix netscaler application delivery controller/14.1
- canonical/citrix netscaler gateway
- version/citrix netscaler gateway/13.0
- version/citrix netscaler gateway/13.1
- version/citrix netscaler gateway/14.1
- canonical/citrix netscaler adc
- canonical/citrix netscaler adc and netscaler gateway