Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability
Summary
| CVE | CVE-2023-4966 |
|---|---|
| State | PUBLIC |
| Assigner | [email protected] |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-10-10 14:15:00 UTC |
| Updated | 2023-11-07 04:23:00 UTC |
| 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. |
Risk And Classification
EPSS: 0.943480000 probability, percentile 0.999580000 (date 2026-04-22)
CISA KEV: Listed on 2023-10-18; due 2023-11-08; ransomware use Known
Problem Types: NVD-CWE-noinfo
CISA Known Exploited Vulnerability
| Vendor | Citrix |
|---|---|
| Product | NetScaler ADC and NetScaler Gateway |
| Name | Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability |
| 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 |
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Application | Citrix | Netscaler Application Delivery Controller | All | All | All | All |
| Application | Citrix | Netscaler Application Delivery Controller | All | All | All | All |
| Application | Citrix | Netscaler Application Delivery Controller | All | All | All | All |
| Application | Citrix | Netscaler Gateway | All | All | All | All |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Citrix Bleed Session Token Leakage Proof Of Concept ≈ Packet Storm | MISC | packetstormsecurity.com | |
| NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2023-4966 and CVE-2023-4967 | MISC | support.citrix.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
| CISA Known Exploited Vulnerabilities catalog | CISA | www.cisa.gov | kev |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 378935 Citrix Application Delivery Controller (ADC) and Citrix Gateway Multiple Vulnerabilities (CTX579459)