Citrix has reported a critical vulnerability affecting NetScaler devices, designated CVE-2025-6543, which is being actively exploited to cause denial-of-service situations. Devices can become unresponsive due to unauthorized external requests targeting specific configurations, notably those set as Gateways. Citrix has issued security patches for affected versions and urges immediate updates. This warning comes alongside another serious vulnerability known as CitrixBleed 2 (CVE-2025-5777), which allows attackers to hijack user sessions. Organizations are advised to monitor for suspicious activity and review access settings.
Citrix warns of a critical vulnerability in NetScaler devices (CVE-2025-6543) leading to denial-of-service attacks, urging immediate updates to mitigate risks.
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