Nearly 2,000 Citrix Netscaler Instances have been compromised with a backdoor by weaponizing a recently disclosed critical security vulnerability as part of a large-scale attack.

“An adversary appears to have exploited CVE-2023-3519 in an automated fashion, placing web shells on vulnerable NetScalers to gain persistent access,” NCC Group said in an advisory released Tuesday.

“The adversary can execute arbitrary commands with this webshell, even when a NetScaler is patched and/or rebooted.”

CVE-2023-3519 refers to a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could lead to unauthenticated remote code execution read more Nearly 2000 Citrix Netscaler Instances Hacked via Critical Vulnerability.

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