CISA has ordered U.S. government agencies to secure their Check Point Remote Access VPN and Mobile Access deployments against a critical vulnerability exploited in zero-day attacks by Qilin ransomware affiliates.
Unauthenticated remote attackers can exploit this security flaw (tracked as CVE-2026-50751) to bypass authentication and establish a remote access VPN connection on targeted Mobile Access/SSL VPNs, Remote Access VPNs, or Spark firewalls.
The vulnerability affects only instances configured to use the deprecated IKEv1 key exchange protocol, with security gateways that don't require a machine certificate for connections and accept legacy Remote Access clients.
Israeli cybersecurity company Check Point released security updates to address CVE-2026-50751 on Monday, flagging it as exploited in attacks that began on May 7 and surged over the weekend.
Although these attacks have only led to breaches at "a few dozen" organizations worldwide, Check Point has linked at least one incident to the Qilin Ransomware-as-a-Service (RaaS) operation, which has claimed over 400 victims on its dark web leak site since it surfaced in August 2022.
