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VulnerabilityCVE-2026-62816Published 2026-08-11

CVE-2026-62816 — Microsoft Windows 10 Version 1607

high

As of 2026-10-08, CVE-2026-62816 is a HIGH-severity vulnerability in Microsoft Windows 10 Version 1607, CVSS v3.1 8.8, EPSS 0.5% (43.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-62816, most recently “Microsoft August 2026 Patch Tuesday: 400 Flaws Fixed, Including Lazarus-Exploited Zero-Day CVE-2026-68820 (AFD.sys) and Two Publicly Disclosed Zero-Days (CVE-2026-62832 "LegacyHive", CVE-2026-72971)”.

CVSS v3.1
8.8/10High
EPSS
0.5%Higher than 43.4% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
6.1/10Threadlinqs triage score
Published
Updated 2026-10-08
CVSS v3.1 8.8 (HIGH) · EPSS 0.5% (higher than 43.4% of all scored CVEs) · Priority 6.1/10 · Published 2026-08-11

Last updated:

What is CVE-2026-62816?

Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.

The record classifies CVE-2026-62816 under weakness classes CWE-122, CWE-190. Its CVSS v3 base vector states that the flaw is reachable from an adjacent network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 12 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 60 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
0.5% probability of exploitation in the next 30 days, higher than 43.4% 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
2026-08-11, last modified 2026-10-08

Is CVE-2026-62816 being exploited?

It currently carries a trending score of 31 in the Threadlinqs vulnerability feed.

Affected products and versions

  • Microsoft: Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 23H2, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2

How to fix CVE-2026-62816

No vendor patch reference has been recorded for CVE-2026-62816 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-2026-62816

1 tracked threat in the Threadlinqs corpus references CVE-2026-62816, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on .

Vendor advisory and patch