Unauthenticated IKEv1 VPN Auth Bypass in Check Point Security Gateways
CISA: Check Point Security Gateway Improper Authentication Vulnerability
CVSS 3.1
9.3critical
EPSS
84%p100
Published
()
KEV added
AI analysis
Check Point has disclosed CVE-2026-50751, a critical (CVSS 9.3) improper authentication flaw (CWE-287) in the certificate validation logic for Remote Access and Mobile Access VPN when the deprecated IKEv1 key exchange is used. An unauthenticated remote attacker can exploit this logic flow weakness during IKEv1 negotiation to bypass user authentication entirely. Successful exploitation lets the attacker establish a remote access VPN connection without a valid user password, gaining access to the organization's internal network resources (high confidentiality impact per the CVSS score). Any organization running a Check Point Security Gateway on Gaia OS or Gaia Embedded with IKEv1-based Remote Access/Mobile Access configured is affected; specific affected and fixed versions are in Check Point's advisory. The flaw is being exploited in the wild — it was added to CISA's Known Exploited Vulnerabilities catalog on 2026-06-08 with known ransomware use and an EPSS of 83.8% — and it was disclosed alongside other critical Check Point VPN certificate flaws per recent headlines.
What to do: Upgrade affected Security Gateways to the fixed releases identified in Check Point's advisory (version numbers are not specified in the source data), prioritizing internet-facing VPN gateways; as an interim mitigation, move Remote Access/Mobile Access clients to IKEv2 or disable IKEv1. Review VPN authentication logs for sessions established without valid credentials, given known in-the-wild and ransomware exploitation. Federal agencies must apply mitigations per BOD 22-01, and defenders should beware of fake 'public PoC' repositories spreading malware (ChocoPoC RAT), since no legitimate public PoC is known.
Affected
Check Point Security Gateway (Gaia OS)
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Check Point Security Gateway (Gaia Embedded)
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Estimated exposure
massplausibly on the order of 100,000+ internet-exposed Check Point gateways, with the IKEv1-affected subset likely tens of thousands of sites (estimate) — Check Point is one of the most widely deployed enterprise firewall/VPN gateway vendors and remote access VPN portals are typically exposed to the internet, but only gateways with deprecated IKEv1 Remote Access/Mobile Access enabled are…
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description
A logic flow weakness in Remote Access and Mobile Access certificate validation in deprecated IKEv1 key exchange allows an unauthenticated remote attacker to bypass user authentication and establish a remote access VPN connection without a valid user password.
CISA Known Exploited Vulnerability
Affected
Check Point Security Gateway
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Check Point patched two critical VPN flaws, CVE-2026-85102 and CVE-2026-85103 (CVSS 9.8), allowing unauthenticated RCE on Security Gateways.
Check Point disclosed and patched two critical VPN vulnerabilities, CVE-2026-85102 (improper certificate trust validation, CWE-295) and CVE-2026-85103 (heap-based buffer overflow in ASN.1 certificate parsing, CWE-122), both rated CVSS 9.8 and exploitable for unauthenticated remote code execution under specific conditions. The flaws affect Security Gateway, Security Management Server, and Spark Firewall deployments on R81.20, R82, and R82.10 branches plus end-of-support versions such as R80.40 and R81, while R82.20 is not affected. Check Point reports no evidence of active exploitation or public PoC; Live Patch rollout began September 9, 2026, and administrators without it must install Jumbo Hotfix Accumulator builds (R82.10 Take 44+, R82 Take 126+, R81.20 Take 166+). For Site-to-Site VPN, restricting UDP ports 500 and 4500 to known peers serves as an interim workaround, but no mitigation exists for Remote Access VPN or Spark Firewalls.
Check Point patched two 9.8-rated VPN certificate flaws, CVE-2026-85102 and CVE-2026-85103, enabling unauthenticated remote code execution; no exploitation observed yet.
Check Point disclosed and began patching two critical (CVSS 9.8) vulnerabilities in VPN certificate handling on September 9: CVE-2026-85102, a certificate trust validation failure in VPN negotiation on Security Gateways, and CVE-2026-85103, a heap-based buffer overflow in ASN.1 decoding affecting Quantum Security Gateways and Security Management Server. Affected branches include R81.20, R82, and R82.10 Jumbo Hotfix levels; fixes ship via Live Patch or the latest Jumbo Hotfix. The company found both internally and reports no evidence of exploitation; the Canadian Centre for Cyber Security also published an advisory listing Spark firewalls.
Check Point patches two critical unauthenticated RCE flaws (CVE-2026-85102, CVE-2026-85103) in VPN gateways and firewalls; no exploitation observed.
Check Point released patches for CVE-2026-85102 and CVE-2026-85103, two critical vulnerabilities (CVSS 9.8) enabling unauthenticated remote code execution in products using VPN functionality. CVE-2026-85102 involves improper validation of certificate data during VPN negotiation, while CVE-2026-85103 is a heap overflow in the VPN certificate ASN.1 decoding flow. Updates cover versions R82.10, R82, and R81.20; manually defining VPN rules is offered as a mitigation, though it does not apply to locally managed Spark Firewall instances. Check Point discovered both flaws internally and reports no evidence of exploitation in the wild.