What is CVE-2026-83833?

CVE-2026-83833 is a high-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-10-13.

How severe is CVE-2026-83833?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Microsoft Windows 10 Version 1607

CVE-2026-83833

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (23.1th percentile), scored 2026-10-15.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83833 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-83833?: CVE-2026-83833 is a high-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-10-13.
How severe is CVE-2026-83833?: High severity. CVSS v3 base score is 7.8 out of 10.