What is CVE-2026-69340?

CVE-2026-69340 is a high-severity vulnerability in Microsoft Windows 10 1607, classified under Heap-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-09-08.

How severe is CVE-2026-69340?

High severity. CVSS v3 base score is 7.1 out of 10.

Buffer overflow in Microsoft Windows 10 1607

CVE-2026-69340

Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

Vulnerability class: Buffer Overflow

Published 2026-09-08 · last modified 2026-09-24.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

References

Windows NTFS Elevation of Privilege Vulnerability (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-69340?: CVE-2026-69340 is a high-severity vulnerability in Microsoft Windows 10 1607, classified under Heap-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-09-08.
How severe is CVE-2026-69340?: High severity. CVSS v3 base score is 7.1 out of 10.