Unpatched Citrix NetScaler systems exposed to the internet are being targeted by unknown threat actors in what’s suspected to be a ransomware attack.
Cybersecurity company Sophos is tracking the activity cluster under the moniker STAC4663.
Attack chains involve the exploitation of CVE-2023-3519, a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could

Unpatched Citrix NetScaler systems exposed to the internet are being targeted by unknown threat actors in what’s suspected to be a ransomware attack.
Cybersecurity company Sophos is tracking the activity cluster under the moniker STAC4663.
Attack chains involve the exploitation of CVE-2023-3519, a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could