How severe is CVE-2023-29360?

CVE-2023-29360 has a CVSS score of 8.4/10, rated HIGH. Immediate patching is strongly recommended.

Which products are affected by CVE-2023-29360?

CVE-2023-29360 affects the following products: microsoft windows 10 21h2, microsoft windows 10 22h2, microsoft windows 10 1607, microsoft windows 10 1809, microsoft windows 11 21h2, microsoft windows 11 22h2, microsoft windows server 2016, microsoft windows server 2019, and 1 more.

How do I patch CVE-2023-29360?

Apply the microsoft windows 10 21h2 security patch or hotfix for CVE-2023-29360 on the affected version, following the vendor advisory for your exact build.

How do I detect CVE-2023-29360 across my infrastructure?

Inventory every microsoft windows 10 21h2 deployment and check each version against the affected-products list above.

How do I mitigate CVE-2023-29360 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Is CVE-2023-29360 actively exploited in the wild?

Yes. There are 6 known exploit references for CVE-2023-29360, including 4 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2023-29360?

CVE-2023-29360 has an EPSS (Exploit Prediction Scoring System) score of 21.6%, placing it in the 98th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2023-29360 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2023-29360 (Microsoft Streaming Service Untrusted Pointer Dereference Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2024-02-29. CISA required all US federal civilian agencies to remediate this vulnerability by 2024-03-21. The required action was: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2023-29360?

CVE-2023-29360 is classified as CWE-822 (CWE-822). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2023-29360?

CVE-2023-29360 affects microsoft windows 10 21h2; microsoft windows 10 22h2; microsoft windows 10 1607; microsoft windows 10 1809, and 5 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2023-29360 published, and has it been updated?

CVE-2023-29360 was published on June 14, 2023 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🛡️

CISA KEV · ACTIVELY EXPLOITED

HIGH severity

CVE-2023-29360 — Windows 10 21h2

HIGH

CVE-2023-29360 is a high-severity (CVSS 8.4) CWE-822 vulnerability in microsoft windows 10 21h2. It is in CISA's Known Exploited Vulnerabilities catalog (added 2024-02-29) — treat it as actively exploited and patch now. A fix is available — see the affected versions and patch details below.

Microsoft Streaming Service Elevation of Privilege Vulnerability

Published

Jun 14, 2023

Updated

Jun 17, 2026

Affected

9 products

Patched

See advisory

Exploits

6 known

Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2024-02-29. Federal agencies were required to remediate by 2024-03-21.
A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2023-29360.

EPSS Exploitation Probability

via FIRST.org ↗

21.6%probability of exploitation in next 30 days

Moderate Risk0.00%

Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2023-29360 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Description

Microsoft Streaming Service Elevation of Privilege Vulnerability

Affected Products

9 products · 10 configurations

windows 10 21h2microsoft

< 10.0.19044.3086

range

windows 10 22h2microsoft

< 10.0.19045.3086

range

windows 10 1607microsoft

< 10.0.14393.5989

range

windows 10 1809microsoft

< 10.0.17763.4499

range

windows 11 21h2microsoft

< 10.0.22000.2057

range

windows 11 22h2microsoft

< 10.0.22621.1848

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Microsoft Streaming Service Elevation of Privilege Vulnerability

github.comGithubSep 2023

Microsoft Streaming Service Elevation of Privilege Vulnerability

github.comGithubOct 2023

Microsoft Streaming Service Elevation of Privilege Vulnerability

cisa.govCISAFeb 2024

Microsoft Streaming Service Elevation of Privilege Vulnerability

github.comGithubAug 2024

Detection & mitigation playbook

Vendor / appliance

Detect
Inventory every microsoft windows 10 21h2 deployment and check each version against the affected-products list above.
Fix
Apply the microsoft windows 10 21h2 security patch or hotfix for CVE-2023-29360 on the affected version, following the vendor advisory for your exact build.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

Microsoft Streaming Service Elevation of Privilege Vulnerability

O3 Security · Runtime Protection

Is CVE-2023-29360 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works

CVE-2023-29360 — Windows 10 21h2

Exploitation Status

Actively exploited in the wild

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Description

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2023-29360 being exploited in your environment?