Summary: A fresh wave of attacks is targeting Citrix NetScaler gateways that remain unpatched against “CitrixBleed 2” (CVE-2025-5777) and related session-hijacking flaws. Threat actors are leveraging the post-holiday return to work to blend malicious traffic with legitimate login surges.
Business Impact: Unpatched gateways provide a “Golden Key” to the network. Attackers can bypass MFA and gain persistent administrative access, leading to ransomware deployment within 48 hours of initial access.
Why It Happened: Many organizations implemented “Change Freezes” during December, leaving critical patches pending. Attackers are exploiting this specific window of vulnerability before IT teams resume normal patching cycles.
Recommended Executive Action: End the holiday change freeze immediately for security patches. Run an external scan of your NetScaler interfaces today. If patching isn’t possible instantly, implement strict geo-blocking and monitor for abnormal session lengths.
Hashtags: #Citrix #NetScaler #Vulnerability #Ransomware #PatchNow #InfrastructureSecurity