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VulnerabilityCVE-2023-36802Published 2023-09-12

CVE-2023-36802 — Microsoft Windows 10 Version 1809

highCISA KEVPublic exploit7 PoC repos

As of 2025-10-30, CVE-2023-36802 is a HIGH-severity vulnerability in Microsoft Windows 10 Version 1809, CVSS v3.1 7.8, EPSS 27.9% (98.0th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-09-12), with a US federal remediation deadline of 2023-10-03. Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2023-36802, most recently “CVE-2023-36802 mskssrv.sys Type Confusion LPE - Public Exploitation Write-up (StarLabs)”.

CVSS v3.1
7.8/10High
EPSS
27.9%Higher than 98.0% of scored CVEs
CISA KEV
ListedAdded · due 2023-10-03
Tracked threats
2Campaigns referencing it
Priority
9/10Threadlinqs triage score
Published
Updated 2025-10-30
CVSS v3.1 7.8 (HIGH) · EPSS 27.9% (higher than 98.0% of all scored CVEs) · Priority 9/10 · Published 2023-09-12

Last updated:

What is CVE-2023-36802?

Microsoft Streaming Service Proxy Elevation of Privilege Vulnerability

The record classifies CVE-2023-36802 under weakness class CWE-416. Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 8 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 1146 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
27.9% probability of exploitation in the next 30 days, higher than 98.0% of all scored CVEs
CISA KEV
Listed since 2023-09-12, federal remediation deadline 2023-10-03
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2023-09-12, last modified 2025-10-30

Is CVE-2023-36802 being exploited?

CISA added CVE-2023-36802 to the Known Exploited Vulnerabilities catalog on 2023-09-12, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2023-10-03 under BOD 22-01. Weaponised exploit code for CVE-2023-36802 is publicly available. 7 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 53 in the Threadlinqs vulnerability feed.

Affected products and versions

  • Microsoft: Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows 11 version 21H2, Windows 10 Version 21H2, Windows 11 version 22H2, Windows 10 Version 22H2

How to fix CVE-2023-36802

Because CVE-2023-36802 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2023-10-03. No vendor patch reference has been recorded for CVE-2023-36802 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-2023-36802

2 tracked threats in the Threadlinqs corpus reference CVE-2023-36802, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .

Vendor advisory and patch