CVE-2026-85103 in Quantum Security Gateway
Summary
by MITRE • 09/09/2026
A heap-based buffer overflow in VPN certificate ASN.1 decoding may allow an unauthenticated remote attacker to execute arbitrary code on Check Point Quantum Security Management and Quantum Security Gateway systems.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability described involves a critical heap-based buffer overflow located within the ASN.1 decoding logic used for processing VPN certificates in Check Point Quantum Security Management and Quantum Security Gateway appliances. This flaw arises from an improper validation of input data during the parsing of Abstract Syntax Notation One structures, which are commonly used to describe data formats for network protocols such as SSL/TLS and IPsec. When a remote attacker sends a specially crafted certificate or related ASN.1 encoded payload to the vulnerable system, the decoder fails to correctly calculate buffer boundaries or verify length fields before copying data into memory. This miscalculation results in writing more data than allocated on the heap, overwriting adjacent memory structures. The absence of rigorous bounds checking allows an unauthenticated attacker to manipulate the control flow of the application by corrupting critical metadata such as function pointers or exception handlers stored within the heap structure.
From a technical perspective, this vulnerability is classified under CWE-122, which denotes a heap-based buffer overflow. This type of flaw is particularly dangerous because it occurs in dynamically allocated memory, making exploitation techniques more complex but also potentially more impactful than stack overflows due to the larger address space available for payload placement and the ability to overwrite multiple objects simultaneously. The attack vector is remote and unauthenticated, meaning that no prior access or credentials are required to trigger the vulnerability. This significantly lowers the barrier to entry for attackers, allowing anyone with network connectivity to attempt exploitation. In many cases, successful exploitation of heap-based buffer overflows in security appliances can lead to arbitrary code execution, granting the attacker full control over the underlying operating system and potentially compromising all managed networks and users protected by the device.
The operational impact of this vulnerability is severe for organizations relying on Check Point Quantum Security Management or Gateway systems as their primary perimeter defense. If an attacker successfully exploits this flaw, they can execute arbitrary code with the privileges of the affected service process. This could lead to a complete compromise of the security appliance itself, allowing the attacker to bypass firewall rules, intercept encrypted traffic through man-in-the-middle attacks using stolen keys, or pivot into internal networks that were previously considered secure behind the gateway. Furthermore, because this affects both management and gateway components, an attacker might gain access to centralized configuration data, potentially altering policies across multiple devices simultaneously. The ability to execute code remotely without authentication makes this a high-severity threat that requires immediate attention to prevent widespread network compromise.
To mitigate this risk, organizations must apply the vendor-provided security patches or updates as soon as they become available for their specific version of Check Point Quantum Security Management and Gateway software. Until patching is complete, it is advisable to restrict access to these systems by implementing strict firewall rules that limit inbound connections from untrusted networks. Additionally, deploying intrusion prevention system signatures that detect malformed ASN.1 packets or anomalous certificate structures can provide a layer of defense against exploitation attempts. Regular vulnerability scanning and continuous monitoring for unusual network traffic patterns related to SSL/TLS handshakes should also be maintained to identify potential attack vectors early. Adhering to these mitigation strategies helps reduce the exposure surface while ensuring that systems are protected against this critical heap-based buffer overflow vulnerability.