CVE-2025-21333

7.8

HIGH CVSS 3.1

Microsoft Windows Hyper-V NT Kernel Integration VSP Heap-based Buffer Overflow Vulnerability - [Actively Exploited]

Description

Windows Hyper-V NT Kernel Integration VSP Elevation of Privilege Vulnerability

INFO

Published Date :

Jan. 14, 2025, 6:15 p.m.

Last Modified :

April 3, 2025, 8:58 p.m.

Remotely Exploit :

No

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Feb 04, 2025

Alert Date: Jan 14, 2025 | 226 days ago

Description :

Microsoft Windows Hyper-V NT Kernel Integration VSP contains a heap-based buffer overflow vulnerability that allows a local attacker to gain SYSTEM privileges.

Required Action :

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes :

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2025-21333 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21333

Affected Products

The following products are affected by CVE-2025-21333 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product
1	Microsoft	windows_10_21h2
2	Microsoft	windows_10_22h2
3	Microsoft	windows_11_22h2
4	Microsoft	windows_11_23h2
5	Microsoft	windows_server_2022_23h2
6	Microsoft	windows_server_23h2
7	Microsoft	windows_11_24h2
8	Microsoft	windows_server_2025

: Total Affected Vendor : 1 | Products : 8

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	HIGH				[email protected]

Solution

Address the Hyper-V NT Kernel integration vulnerability for elevation of privilege.

Update Windows to the latest security patches.
Apply hotfixes specific to Hyper-V.
Verify Hyper-V configuration settings.
Monitor system for suspicious activity.

Public PoC/Exploit Available at Github

CVE-2025-21333 has a 11 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-21333.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21333	Patch Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-detection-script	Mitigation Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2025-21333-elevated-privilege-exposure-in-windows-hyper-v-by-microsoft-mitigation-script	Mitigation Third Party Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-21333 is associated with the following CWEs:

CWE-122: Heap-based Buffer Overflow

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-21333 weaknesses.

CAPEC-92: Forced Integer Overflow Forced Integer Overflow

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

B1ack4sh/Blackash-CVE-2025-21333

CVE-2025-21333

C++ C

Updated: 2 months, 2 weeks ago

2 stars 0 fork 0 watcher

Born at : June 11, 2025, 7:59 p.m. This repo has been linked 1 different CVEs too.

jibinjobyp/internshipdaythree

None

Updated: 2 months, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : June 1, 2025, 3:17 p.m. This repo has been linked 8 different CVEs too.

BlackTom900131/awesome-game-security

None

Python

Updated: 1 month, 2 weeks ago

3 stars 1 fork 1 watcher

Born at : April 8, 2025, 8:45 a.m. This repo has been linked 23 different CVEs too.

ghostbyt3/WinDriver-EXP

This repo contains PoCs for vulnerable Windows drivers.

C++ C

Updated: 3 weeks, 5 days ago

13 stars 1 fork 1 watcher

Born at : March 19, 2025, 10:02 p.m. This repo has been linked 8 different CVEs too.

aleongx/KQL_sentinel_CVE-2025-21333

KQL para deteccion de CVE-2025-21333 en Sentinel

Updated: 5 months, 2 weeks ago

0 stars 0 fork 0 watcher

Born at : March 11, 2025, 5:32 p.m. This repo has been linked 1 different CVEs too.

MrAle98/CVE-2025-21333-POC

POC exploit for CVE-2025-21333 heap-based buffer overflow. It leverages WNF state data and I/O ring IOP_MC_BUFFER_ENTRY

C++ C

Updated: 1 month, 3 weeks ago

196 stars 32 fork 32 watcher

Born at : Feb. 27, 2025, 12:36 p.m. This repo has been linked 2 different CVEs too.

plzheheplztrying/cve_monitor

None

HTML Python Shell

Updated: 1 month, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Feb. 13, 2025, 8:50 a.m. This repo has been linked 891 different CVEs too.

ums91/CISA_BOT

CISA Bot is a GitHub bot that automatically monitors the Cybersecurity and Infrastructure Security Agency (CISA) Known Exploited Vulnerabilities (KEV) Catalog. When new vulnerabilities are published in the KEV, the bot creates GitHub issues in this repository with detailed information about each vulnerability.

Python

Updated: 1 day, 11 hours ago

2 stars 1 fork 1 watcher

Born at : Oct. 29, 2024, 10:19 a.m. This repo has been linked 205 different CVEs too.

gmh5225/awesome-game-security

awesome game security [Welcome to PR]

game awesome cheat anticheat windows debug antidebug engine security anti driver kernel hack gamehack system android game-development web3 blockchain ethereum

Python

Updated: 1 day, 5 hours ago

2543 stars 347 fork 347 watcher

Born at : April 4, 2022, 6:07 a.m. This repo has been linked 25 different CVEs too.

GhostTroops/TOP

TOP All bugbounty pentesting CVE-2023- POC Exp RCE example payload Things

bugbounty cve exp exploit payload poc rce vulnerability

Shell

Updated: 1 day, 12 hours ago

705 stars 121 fork 121 watcher

Born at : March 19, 2022, 1:54 a.m. This repo has been linked 288 different CVEs too.

nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 1 day, 6 hours ago

7221 stars 1200 fork 1200 watcher

Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 804 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-21333 vulnerability anywhere in the article.

Daily CyberSecurity

Microsoft Unveils a New Tool to Help Businesses Ditch VMware for Hyper-V

For reasons of compliance and data governance, many large enterprises prefer to purchase servers for on-premises deployment, then rely on virtualization technology to create multiple virtual machines ...

Published Date: Aug 26, 2025 (2 days, 9 hours ago)

Daily CyberSecurity

Kaspersky Report Reveals Growing Threat from Old Exploits and OS Vulnerabilities in Q1 2025

Kaspersky’s latest “Exploits and vulnerabilities in Q1 2025” shows that attackers are doubling down on aging exploits, platform-specific weaknesses, and mismanaged updates. With over 9,700 vulnerabili ...

Published Date: Jun 03, 2025 (2 months, 3 weeks ago)

Kaspersky

Exploits and vulnerabilities in Q1 2025

The first quarter of 2025 saw the continued publication of vulnerabilities discovered and fixed in 2024, as some researchers were previously unable to disclose the details. This partially shifted the ...

Published Date: May 30, 2025 (2 months, 4 weeks ago)

Help Net Security

Microsoft vulnerabilities: What’s improved, what’s at risk

Microsoft reported a record 1,360 vulnerabilities in 2024, according to the latest BeyondTrust Microsoft Vulnerabilities Report. The volume marks an 11% increase from the previous record in 2022 and f ...

Published Date: Apr 17, 2025 (4 months, 1 week ago)

Cyber Security News

Windows Hyper-V NT Kernel Vulnerability Let Attackers Gain SYSTEM Privileges – PoC Released

Threat actors have actively exploited CVE-2025-21333, a critical vulnerability in Microsoft’s Windows Hyper-V NT Kernel Integration Virtual Service Provider (VSP). This heap-based buffer overflow vuln ...

Published Date: Mar 03, 2025 (5 months, 3 weeks ago)

Cyber Security News

Critical Vulnerability in Wazuh Server Enables Remote Attackers to Execute Malicious Code

A critical remote code execution (RCE) vulnerability has been discovered in the Wazuh server, a popular open-source security platform used for threat detection and compliance monitoring. Identified as ...

Published Date: Mar 03, 2025 (5 months, 3 weeks ago)

Cybersecurity News

Windows Hyper-V Zero-Day CVE-2025-21333: PoC Drops, SYSTEM Access Exposed

Security researcher Alessandro Iandoli has published a proof-of-concept (PoC) exploit for CVE-2025-21333, a zero-day vulnerability in Windows Hyper-V that has been actively exploited in attacks. The f ...

Published Date: Mar 03, 2025 (5 months, 3 weeks ago)

Help Net Security

February 2025 Patch Tuesday forecast: New directions for AI development

The new year has started with a whirlwind of activity, and one of the hottest topics in the news is the increasing emphasis on AI. DeepSeek ad Stargate DeepSeek took the world by storm as millions of ...

Published Date: Feb 10, 2025 (6 months, 2 weeks ago)

tripwire.com

Tripwire Patch Priority Index for January 2025

Tripwire's January 2025 Patch Priority Index (PPI) brings together important vulnerabilities for Microsoft.First on the list are patches for the Microsoft office platform, including Word, Access, Visi ...

Published Date: Feb 04, 2025 (6 months, 3 weeks ago)

CrowdStrike.com

January 2025 Patch Tuesday: 10 Critical Vulnerabilities and Eight Zero-Days Among 159 CVEs

Microsoft has released security updates for 159 vulnerabilities in its January 2025 Patch Tuesday rollout. Among these are 10 Critical vulnerabilities and eight zero-days affecting the Windows Hyper-V ...

Published Date: Jan 30, 2025 (6 months, 4 weeks ago)

CrowdStrike.com

January 2025 Patch Tuesday: 10 Critical Vulnerabilities and Eight Zero-Days Among 159 CVEs

Published Date: Jan 30, 2025 (6 months, 4 weeks ago)

CrowdStrike.com