# CVE-2023-4966: Unauthenticated sensitive information disclosure

> CVE-2023-4966: Unauthenticated sensitive information disclosure. CVSS 9.4 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2023-4966
Last updated: 2026-07-31T03:55:28Z

- Published: 2023-10-10 13:12 UTC · Updated: 2026-07-31 03:55 UTC · Assigner: Citrix
- CVSS: 9.4 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
- EPSS: 100.0%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2023-10-18, federal due date 2023-11-08, ransomware use: Known
- CWE: CWE-119

## 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.

## CISA 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.

## Affected vendors and products

- Citrix: NetScaler ADC
- Citrix: NetScaler Gateway

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2023-4966)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2023-4966)
- [http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html](http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html)
- [https://support.citrix.com/article/CTX579459](https://support.citrix.com/article/CTX579459)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2023-4966 · Markdown: https://rewindex.com/cve/CVE-2023-4966.md · JSON: https://rewindex.com/api/v1/cves/CVE-2023-4966 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:50:57.492Z