Quantum Security Gateway CVE-2026-48135

No special authentication or user interaction is required - the CVSS vector AV:N/AC:L/PR:N/UI:N confirms remote unauthenticated exploitation against the HTTP-based service of Check Point Quantum Security Gateway. The limiting condition is that the vulnerable HTTP-based service must be network-reachable by the attacker; if the service is firewalled or restricted to trusted management networks, the attack surface is significantly reduced. The vulnerability is present across a wide version range (all R81.10 and below, specific hotfix levels of R81.20, R82, and R82.10), so version alone does not limit exposure without a confirmed patched hotfix applied. No specific non-default configuration is identified as a prerequisite - the HTTP request parsing flaw appears to be in core service functionality.

There is a meaningful and explicit conflict between the CVSS scoring and the SSVC assessment that security teams must not overlook. CVSS 5.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) positions this as a medium-severity partial-DoS with no confidentiality or integrity impact. However, SSVC independently assesses Technical Impact as 'total' - a classification typically reserved for vulnerabilities enabling full system compromise or complete data loss. CWE-122 (Heap-based Buffer Overflow) is consistent with the SSVC assessment, as heap overflows have historically been escalated to remote code execution under favorable heap layout conditions. Whether the 'A:L' CVSS score accurately reflects the ceiling of exploitability, or whether it reflects exploitation difficulty at the time of scoring, is not confirmed from available data. EPSS at 0.06% (19th percentile) indicates very low observed exploitation probability at time of analysis, and the vulnerability is not listed in the CISA KEV catalog. Nevertheless, SSVC Automatable: yes combined with AV:N/AC:L/PR:N/UI:N means internet-scale automated scanning and exploitation is theoretically feasible. This is a real priority for organizations running exposed Quantum Security Gateways - not because exploitation is confirmed, but because the attack surface is unauthenticated, network-reachable, and requires no interaction.

An unauthenticated remote attacker sends a series of specially crafted malformed HTTP requests to the Check Point Quantum Security Gateway's HTTP-based service from anywhere on the network. The malformed input triggers a heap-based buffer overflow in the request parsing routine, corrupting adjacent heap memory and causing the service to crash or become unresponsive. Given that SSVC rates the attack as automatable, a scripted scanner could identify and exploit vulnerable gateways at internet scale without requiring any credentials or prior access.