---
title: "CVE-2023-4966: Unauthenticated sensitive information… | CubePath"
description: "Sensitive information disclosure in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy)…"
language: en
source: https://cubepath.com/security/cve/CVE-2023-4966
---

# CVE-2023-4966: Unauthenticated sensitive information… | CubePath

## 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.

Official description from the CVE record, published by Citrix. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-4966)

## Key data

### CVSS 3.1 Critical 9.4

Score published by Citrix in the CVE record.

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

| Metric                 | Value     | What it means                                                                       |
| ---------------------- | --------- | ----------------------------------------------------------------------------------- |
| Attack vector          | Network   | The vulnerable component can be reached over a network, possibly from the Internet. |
| Attack complexity      | Low       | No special conditions are needed. The attack can be repeated at will.               |
| Privileges required    | None      | No account or privileges are needed.                                                |
| User interaction       | None      | No action from any user is needed.                                                  |
| Scope                  | Unchanged | The impact stays within the vulnerable component.                                   |
| Confidentiality impact | High      | Serious or total effect on the secrecy of data.                                     |
| Integrity impact       | High      | Serious or total effect on the trustworthiness of data.                             |
| Availability impact    | Low       | Limited effect on availability.                                                     |

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at [first.org/cvss](https://www.first.org/cvss/) .

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.99999 (99.99% probability)

Percentile

99.99%

Scores of

Nov 10, 2026

Model

v2026.06.15

### CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.

Name in the catalog

Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability

Added to the catalog

Oct 18, 2023

Federal due date

Nov 8, 2023

Ransomware campaigns

Known use

### CISA assessment as of Oct 10, 2023

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.

Exploitation

Recorded by CISA as active

Automatable

yes

Technical impact

total

### Weakness (CWE)

CWE catalog version 5.0.

CWE names: Copyright © 2006-2026, The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CWE license.

- [CWE-119](https://cwe.mitre.org/data/definitions/119.html) Improper Restriction of Operations within the Bounds of a Memory Buffer

## Affected products

Products listed in the CVE record, as the CNA published them.

- Citrix NetScaler ADC

  - affected: 14.1 up to before 8.50
  - affected: 13.1 up to before 49.15
  - affected: 13.0 up to before 92.19
  - affected: 13.1-FIPS up to before 37.164
  - affected: 12.1-FIPS up to before 55.300
  - affected: 12.1-NDcPP up to before 55.300
- Citrix NetScaler Gateway

  - affected: 14.1 up to before 8.50
  - affected: 13.1 up to before 49.15
  - affected: 13.0 up to before 92.19

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [support.citrix.com/article/CTX579459](https://support.citrix.com/article/CTX579459)
- [packetstormsecurity.com/files/175323/Citrix-Bleed-Session-T…](http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html)

## Timeline

1. ID reserved Sep 14, 2023
2. Record published Oct 10, 2023
3. Added to CISA KEV Oct 18, 2023
4. Record last updated Jul 31, 2026

## Look up another CVE

## About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.

[Cloud VPS](https://cubepath.com/vps) [DDoS protection](https://cubepath.com/ddos-protection)

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:03 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)