Unauthenticated sensitive information disclosure
Summary
| CVE | CVE-2023-4966 |
|---|---|
| State | PUBLISHED |
| Assigner | Citrix |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2023-10-10 14:15:10 UTC |
| Updated | 2026-07-31 04:16:44 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
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.999990000 probability, percentile 0.999980000 (date 2026-08-13)
CISA KEV: Listed on 2023-10-18; due 2023-11-08; ransomware use Known
Problem Types: CWE-119 | NVD-CWE-noinfo | CWE-119 CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| 3.1 | [email protected] | Secondary | 9.4 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L |
| 3.1 | CNA | CVSS | 9.4 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Citrix | NetScaler ADC | affected 14.1 8.50 patch | Not specified |
| CNA | Citrix | NetScaler ADC | affected 13.1 49.15 patch | Not specified |
| CNA | Citrix | NetScaler ADC | affected 13.0 92.19 patch | Not specified |
| CNA | Citrix | NetScaler ADC | affected 13.1-FIPS 37.164 patch | Not specified |
| CNA | Citrix | NetScaler ADC | affected 12.1-FIPS 55.300 patch | Not specified |
| CNA | Citrix | NetScaler ADC | affected 12.1-NDcPP 55.300 patch | Not specified |
| CNA | Citrix | NetScaler Gateway | affected 14.1 8.50 patch | Not specified |
| CNA | Citrix | NetScaler Gateway | affected 13.1 49.15 patch | Not specified |
| CNA | Citrix | NetScaler Gateway | affected 13.0 92.19 patch | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Citrix Bleed Session Token Leakage Proof Of Concept ≈ Packet Storm | af854a3a-2127-422b-91ae-364da2661108 | packetstormsecurity.com | Third Party Advisory, VDB Entry |
| www.cisa.gov/known-exploited-vulnerabilities-catalog | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.cisa.gov | US Government Resource |
| NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2023-4966 and CVE-2023-4967 | af854a3a-2127-422b-91ae-364da2661108 | support.citrix.com | Vendor Advisory |
| 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.
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| ADP | 2023-10-18T00:00:00.000Z | CVE-2023-4966 added to CISA KEV |
Legacy QID Mappings
- 378935 Citrix Application Delivery Controller (ADC) and Citrix Gateway Multiple Vulnerabilities (CTX579459)