Threat Intelligence / CVE / CVE-2023-4966
CVE-2023-4966
CISA KEVRansomwareAs of 2025-10-24, CVE-2023-4966 is a CVSS 9.4 (CRITICAL-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 94.3%. Threadlinqs Intelligence tracks 3 threats exploiting it.
Last updated: 2025-10-24
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.
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Weaknesses (CWE)
CWE-119, NVD-CWE-noinfo
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- CitrixBleed-Class NetScaler ADC/Gateway SAML AuthnRequest Memory Disclosure (CVE-2026-8451) Exploited Within 24 Hours of Disclosure — CRITICAL
- Kyber Ransomware: Post-Quantum Hybrid Encryption Operation Targeting Windows & VMware ESXi — CRITICAL
- INC Ransom Affiliate Network Targeting Pacific Critical Infrastructure (AU/NZ/Tonga Joint Advisory) — CRITICAL
References
- http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html
- https://support.citrix.com/article/CTX579459
- http://packetstormsecurity.com/files/175323/Citrix-Bleed-Session-Token-Leakage-Proof-Of-Concept.html
- https://support.citrix.com/article/CTX579459
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4966
Full detection coverage & IOCs for threats exploiting CVE-2023-4966 are available via the Threadlinqs MCP server (Purple tier). View plans →
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.