Threat Intelligence / CVE / CVE-2026-85103

CVE-2026-85103 — checkpoint Quantum Security Gateway

CVSS v3.1 9.8 (CRITICAL) · EPSS 0.3% (higher than 29.4% of all scored CVEs) · Priority 6.1/10 · Published 2026-09-09

As of 2026-09-10, CVE-2026-85103 is a CRITICAL-severity vulnerability in checkpoint Quantum Security Gateway, CVSS v3.1 9.8, EPSS 0.3% (29.4th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-85103, most recently “Eclypsium InfraTrust Report: Mass Active Exploitation of Network Management Systems (Cisco FMC/ISE CVE-2026-20079, CVE-2026-76460; SonicWall SMA 1000 CVE-2026-83548/83549; Linux Kernel CopyFail CVE-2026-31431)”.

Last updated: 2026-09-10

What is CVE-2026-85103?

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.

The record classifies CVE-2026-85103 under weakness class CWE-122. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 15 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.3% probability of exploitation in the next 30 days, higher than 29.4% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
6.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-09-09, last modified 2026-09-10

Is CVE-2026-85103 being exploited?

No public exploitation evidence for CVE-2026-85103 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-09-10. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-85103

No vendor patch reference has been recorded for CVE-2026-85103 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-85103

2 tracked threats in the Threadlinqs corpus reference CVE-2026-85103, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-85103 are available via the Threadlinqs MCP server (Purple tier). View plans →

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