CVE-2026-85103: Check Point Quantum Security Gateway, Quantum Security Management Heap-based Buffer Overflow

Vulnerability summary

CVE-2026-85103 is a critical (CVSS 9.8) Heap-based Buffer Overflow vulnerability in Check Point Quantum Security Gateway, Quantum Security Management. It is known to be exploited: ENISA lists it, first on 25-09-2026. EPSS estimates a 3.65% chance of exploitation in the next 30 days, higher than 89.4% of scored vulnerabilities.

Timeline

1. 09-09-2026
   PublishedVulnerability first disclosed.
2. 10-09-2026
   Last modifiedVulnerability information updated.
3. 25-09-2026
   Added to ENISA KEVAdded to the ENISA known exploited vulnerabilities catalog.

Description

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.

• CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().