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6 results for “Citrix”
CVE-2026-19490 Citrix NetScaler auth bypass is under active exploitation with 22,000+ exposed gateways. Patch to 14.1-73.32 now. The prior CVE-2026-8452 hotfix is insufficient.
CVE-2026-8452 Citrix NetScaler SAML RCE: pre-auth heap overflow exploited in 24 hours after PoC. Webshells x.php and z.php active. CISA KEV deadline is today. Patch to 14.1-73.32 now.
CVE-2026-8451 hit Citrix NetScaler ADC within 24 hours of disclosure. 71 IPs logged 424 exploitation signals targeting SAML session tokens.
CVE-2023-4966, named Citrix Bleed, is a buffer over-read vulnerability in Citrix NetScaler ADC and Gateway that leaks memory contents, including active user session tokens, via unauthenticated HTTP requests. Stolen tokens bypass MFA because they represent already-authenticated sessions. Exploited as a zero-day by LockBit ransomware against Boeing, Comcast Xfinity, and others.
CVE-2023-3519 is a CVSS 9.8 unauthenticated remote code execution vulnerability in Citrix NetScaler ADC and NetScaler Gateway (formerly Citrix ADC / Citrix Gateway). Exploited as a zero-day before any patch was available, it was used to compromise a US critical infrastructure organization. After patches were released, mass exploitation resulted in over 2,000 backdoored appliances within days. Requires the device to be configured as a Gateway or AAA virtual server.
CVE-2019-19781 is a pre-authentication path traversal vulnerability in Citrix ADC (NetScaler ADC) and Citrix Gateway that allows unauthenticated attackers to execute arbitrary OS commands. Exploited at mass scale before patches were released, it was used by nation-state APT groups and ransomware operators to compromise enterprise and government VPN gateways worldwide.
