# CVE-2023-36802 — Microsoft Windows 10 Version 1809

**CISA KEV**

> 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)”.

**Last updated:** 2025-10-30

## What is CVE-2023-36802?

Microsoft Streaming Service Proxy Elevation of Privilege Vulnerability

The record classifies CVE-2023-36802 under weakness class [CWE-416](https://intel.threadlinqs.com/cwe/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.

- [chompie1337/Windows_MSKSSRV_LPE_CVE-2023-36802](https://github.com/chompie1337/Windows_MSKSSRV_LPE_CVE-2023-36802) (github)
- [Nero22k/cve-2023-36802](https://github.com/Nero22k/cve-2023-36802) (github)
- [x0rb3l/CVE-2023-36802-MSKSSRV-LPE](https://github.com/x0rb3l/CVE-2023-36802-MSKSSRV-LPE) (github)
- [4zur-0312/CVE-2023-36802](https://github.com/4zur-0312/CVE-2023-36802) (github)
- [rahul0xkr/Reproducing-CVE-2023-36802](https://github.com/rahul0xkr/Reproducing-CVE-2023-36802) (github)
- [nhh9905/CVE-2023-36802](https://github.com/nhh9905/CVE-2023-36802) (github)
- [trickest/cve](https://github.com/trickest/cve/blob/main/2023/CVE-2023-36802.md) (trickest)

## Affected products and versions

- [Microsoft](https://intel.threadlinqs.com/vendors/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.

- [CVE-2023-36802 mskssrv.sys Type Confusion LPE - Public Exploitation Write-up (StarLabs)](https://intel.threadlinqs.com/threat/TL-2026-4942) — HIGH · 2026-11-01
- [CVE-2023-36802 (Windows Streaming Service Proxy mskssrv.sys) — Full Exploitation Chain Without NtQuery*/PreviousMode Shortcuts](https://intel.threadlinqs.com/threat/TL-2026-1539) — HIGH · 2026-06-24

## Sources

Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [msrc.microsoft.com — vendor advisory](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-36802)

Canonical: https://intel.threadlinqs.com/cve/CVE-2023-36802
Full detection coverage and IOCs for threats exploiting CVE-2023-36802 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp