Cybersecurity researchers and federal agencies have warned of active exploitation involving a zero-day vulnerability in Citrix NetScaler ADC and Gateway appliances, identified as CVE-2023-3519. This critical flaw allows unauthenticated remote code execution, which attackers have leveraged to gain unauthorized access and deploy persistent web shells on compromised systems.
The exploitation was initially discovered within critical infrastructure sectors, where attackers used the vulnerability to facilitate lateral movement and data collection. Security experts urge administrators to apply the latest patches immediately, as the exploit is highly reliable and the affected devices often serve as primary entry points for enterprise networks.
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