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A threat actor has compromised close to 2,000 thousand Citrix NetScaler servers in a massive campaign exploiting the critical-severity remote code execution tracked as CVE-2023-3519.
Many organizations have failed to patch a critical zero-day vulnerability, allowing hackers to install Web shells on hundreds of endpoints.
Hundreds of Citrix Netscaler ADC and Gateway servers have already been breached and backdoored in a series of attacks targeting a critical remote code execution (RCE) vulnerability tracked as CVE-2023-3519.
Researchers have revealed new details about "Decoy Dog", a sophisticated toolkit discovered in April 2023 that has observed activity largely in Russia and Eastern Europe.
Citrix NetScaler appliances are at risk via the same flaw adversaries used to steal Active Directory data from a critical infrastructure organization in June.