Citrix warns of new Netscaler zero-days exploited in attacks

Citrix urged customers on Tuesday to immediately patch Netscaler ADC and Gateway appliances exposed online against two actively exploited zero-day vulnerabilities.

The two zero-days impact the Netscaler management interface and expose unpatched Netscaler instances to remote code execution and denial-of-service attacks, respectively.

In a security advisory published today, Citrix urged all admins to immediately patch their Netscaler appliances against the two zero-days to block potential attacks.

“Cloud Software Group strongly urges affected customers of NetScaler ADC and NetScaler Gateway to install the relevant updated versions as soon as possible.”

Another critical Netscaler flaw patched in October and tracked as CVE-2023-4966 was also exploited as a zero-day since August by various threat groups to hack into the networks of government organizations and high-profile tech companies worldwide, such as Boeing.

HHS’ security team, the Health Sector Cybersecurity Coordination Center, also issued a sector-wide alert urging health organizations to secure their NetScaler ADC and NetScaler Gateway instances against surging ransomware attacks.

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