Dutch NCSC Issues Urgent Warning: Imminent Exploitation of Critical Check Point VPN Flaws Expected

The Dutch National Cyber Security Centre (NCSC) has issued a grave warning regarding the imminent exploitation of two critical vulnerabilities within Check Point VPN solutions, identified as CVE-2026-85102 and CVE-2026-85103. While no publicly available proof-of-concept exploits have been reported to date, the NCSC’s assessment underscores a high probability of successful attacks and significant potential impact, urging organizations to immediately deploy security updates.

Heightened Alert: A Looming Threat to Enterprise Security

The NCSC’s advisory, published on their official Dutch-language portal, explicitly states, "The NCSC assesses the likelihood of exploitation and the potential impact as high and expects exploitation attempts to occur soon." This emphatic declaration signals a critical juncture for businesses relying on Check Point VPN for secure remote access. Check Point VPN is a cornerstone of modern enterprise security, enabling employees to establish encrypted connections to internal corporate networks, thereby facilitating remote work and safeguarding sensitive data during transit. The potential for exploitation of these flaws could grant attackers unfettered access, leading to devastating consequences.

The Technical Underpinnings: Unpacking CVE-2026-85102 and CVE-2026-85103

At the heart of the NCSC’s concern lie two distinct but equally dangerous vulnerabilities.

CVE-2026-85102: Improper Validation of Certificate Data

This vulnerability stems from an improper validation of certificate data during the VPN negotiation process. In essence, a flaw in how the VPN software verifies the authenticity and integrity of digital certificates used to establish secure connections allows a remote attacker to potentially bypass security checks. Successful exploitation could enable an attacker to execute arbitrary code on a Check Point Security Gateway. This means an attacker could potentially inject malicious commands or software, gaining a foothold within the network’s perimeter defenses.

CVE-2026-85103: Heap Overflow in ASN.1 Decoder

The second critical flaw, CVE-2026-85103, is a heap overflow vulnerability residing within the VPN certificate’s Abstract Syntax Notation One (ASN.1) decoder. Heap overflow vulnerabilities occur when a program attempts to write data beyond the allocated memory buffer for a given data structure, potentially overwriting adjacent memory. In this context, an attacker could trigger this overflow by sending specially crafted certificate data, leading to a crash or, more alarmingly, remote code execution on both Security Gateways and Security Management Servers. This could grant an attacker extensive control over critical network infrastructure components.

Affected Systems and Patching Urgency

Check Point has identified several versions of its VPN products that are susceptible to these vulnerabilities. Affected releases include:

• R81.20
• R82
• R82.10
• R81.10.x
• R82.00.x

Furthermore, even end-of-support (EoS) versions are at risk, including:

• R80 through R80.40
• R81
• R81.10

The company issued patches for these critical flaws on September 9, detailing them in separate security advisories: sk1000117 and sk1000118. The recommended solution for immediate protection involves applying the Check Point LivePatch Take 24 for R81.20, R82, and R82.10. Patches are also incorporated into subsequent version updates. Notably, Check Point VPN version R82.20 is not affected by either of these specific vulnerabilities.

Timeline of Events and Vendor Response

The timeline of this unfolding security incident is crucial for understanding the urgency and the response from the affected parties:

• Pre-September 9, 2026: Vulnerabilities CVE-2026-85102 and CVE-2026-85103 exist undiscovered or unreported within the specified Check Point VPN versions.
• September 9, 2026: Check Point releases security fixes for both vulnerabilities, accompanied by detailed security advisories (sk1000117 and sk1000118). Simultaneously, Check Point’s community forums feature an "Action Required: Critical Security Advisory" post, alerting users to the issue.
• September 9, 2026 (Post-Release): Check Point Live Patch (CPLP) users are informed that they should have received automatic protections for these flaws without requiring a server reboot, provided they are using compatible versions (R82.10, R82, and R81.20) and configurations.
• Shortly thereafter (Exact date not specified in original report, but implied to be before the NCSC warning): The Dutch NCSC begins its analysis of the vulnerabilities and their potential impact.
• Current Date (as per the article): The NCSC issues its high-priority warning, citing imminent exploitation and urging immediate action.

This chronological overview highlights the swift response from Check Point in addressing the vulnerabilities once they were identified. However, the NCSC’s warning indicates that the threat landscape has evolved, and the window for proactive defense is rapidly closing.

Broader Implications and Risk Mitigation Strategies

The successful exploitation of CVE-2026-85102 and CVE-2026-85103 could have far-reaching consequences for organizations. The NCSC explicitly warns that attackers could gain:

• Full control of a compromised system: This could include the ability to install malware, exfiltrate data, or use the compromised system as a pivot point for further network intrusions.
• Unauthorized access to and modification of confidential data: Sensitive financial records, intellectual property, customer information, and strategic plans could be exposed or tampered with.
• Disruption of business operations: Attackers could render critical systems inoperable, leading to significant downtime, financial losses, and reputational damage.

Given the severity of the potential impact, the NCSC’s recommendation extends beyond simply applying patches. For organizations utilizing the "Site-to-Site VPN" component, a crucial additional measure is advised: modifying VPN rules to restrict access to only specific, trusted IP addresses. This layered security approach significantly reduces the attack surface, ensuring that even if a VPN gateway is compromised, the attacker’s ability to move laterally within the network is severely limited.

The Role of Automated Patching and LivePatch Technology

Check Point’s Live Patch (CPLP) technology plays a significant role in mitigating the immediate threat for a subset of users. The company’s community forum post indicates that users of CPLP on supported versions (R82.10, R82, and R81.20) should have received automatic protections. This technology allows for the deployment of security fixes without the need for a system reboot, minimizing operational disruption. However, the caveat that CPLP does not support all configurations or versions underscores the importance of direct verification for all users. Administrators are urged to confirm their protection status, especially if they are not on the latest supported versions or have custom configurations.

Industry Context: The Persistent Threat of VPN Vulnerabilities

The discovery and potential exploitation of critical vulnerabilities in VPN solutions are not isolated incidents but rather a recurring theme in the cybersecurity landscape. VPNs, by their very nature, are high-value targets for attackers. They represent the gateway to an organization’s most sensitive internal resources. When these gateways are compromised, attackers can bypass many traditional perimeter defenses.

Past incidents involving other VPN vendors have demonstrated the catastrophic consequences of unpatched vulnerabilities, often leading to widespread data breaches and significant financial repercussions. The NCSC’s proactive warning highlights the increasing sophistication of threat actors who can rapidly develop exploits for newly disclosed vulnerabilities. This underscores the paramount importance of a robust vulnerability management program, which includes not only timely patching but also continuous monitoring and threat intelligence gathering.

Call to Action: A Unified Front Against Cyber Threats

The NCSC’s warning serves as a critical reminder to all organizations that cybersecurity is an ongoing and evolving battle. The imminent threat posed by CVE-2026-85102 and CVE-2026-85103 demands immediate and decisive action. System administrators are strongly advised to:

1. Prioritize Patch Deployment: Immediately install the security updates provided by Check Point, including LivePatch where applicable and supported.
2. Review and Harden VPN Configurations: For Site-to-Site VPN users, rigorously review and restrict VPN rules to only trusted IP addresses.
3. Verify Protection Status: Confirm that patches have been successfully applied and that automated protections are functioning as expected, especially for CPLP users.
4. Stay Informed: Monitor official advisories from Check Point and cybersecurity agencies like the NCSC for any further updates or recommendations.
5. Enhance Monitoring: Increase vigilance on network traffic and security logs for any signs of suspicious activity that might indicate an attempted or successful exploitation.

By adhering to these recommendations, organizations can significantly bolster their defenses against these critical Check Point VPN vulnerabilities and mitigate the risk of potentially devastating cyberattacks. The NCSC’s alert is not merely a notification; it is a call to action for a unified and proactive approach to cybersecurity in an increasingly perilous digital world.