# CVE-2023-4966 (Citrix Bleed)

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.

- Page: https://www.vulneraibility.com/cve/CVE-2023-4966
- CVSS: 9.4
- Known exploited: yes, in CISA KEV since 2023-10-18; CISA due date 2023-11-08; known ransomware use
- EPSS: 100.00% (percentile 100.0)
- Unvetted proof-of-concept code on GitHub: 1 Metasploit module · 14 GitHub proofs of concept · 1 Nuclei template (first 2023-10-24)
- CISA SSVC: exploitation active, automatable yes, technical impact total (assessed 2023-10-10)
- Weakness: CWE-119
- Published: 2023-10-10

## Affected versions

- Citrix NetScaler ADC: affected >= 14.1 and < 8.50; >= 13.1 and < 49.15; >= 13.0 and < 92.19; >= 13.1-FIPS and < 37.164; >= 12.1-FIPS and < 55.300; >= 12.1-NDcPP and < 55.300
- Citrix NetScaler Gateway: affected >= 14.1 and < 8.50; >= 13.1 and < 49.15; >= 13.0 and < 92.19

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.citrix.com/article/CTX579459
- [other] http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4966

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.