CVE-2022-41033: Windows COM+ Event System Service type confusion privilege escalation

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 17 September 2026. Confidence: medium.

high priorityIt is confirmed exploited in the wild per CISA KEV and gives full SYSTEM-level escalation, though it requires local access and a low-privileged account first.

What it is

CVE-2022-41033 is a type confusion (CWE-843) flaw in the Windows COM+ Event System Service that allows a local user to elevate privileges. It affects a broad set of Windows client and server releases, and Microsoft addressed it with an October 2022 update. Because it grants SYSTEM-level access from an unprivileged local session, it is a valuable post-compromise escalation step.

Impact

An attacker with a low-privileged local account gains elevated privileges, with high impact to confidentiality, integrity and availability per the CVSS vector. In practice this yields SYSTEM-level control of the host, enabling credential theft, persistence and defense evasion.

Attack surface

Reached locally (AV:L) by an authenticated low-privileged user (PR:L) with no user interaction (UI:N); no network or remote vector is described. Exploitation requires code execution on the target host, typically after initial access.

Exploitation

It is listed in CISA's Known Exploited Vulnerabilities catalog with a 2022-11-01 remediation due date, indicating exploitation in the wild. EPSS is modest (about 1.7% 30-day probability, ~76th percentile), and no ransomware campaign use is recorded.

What to do

• Apply the Microsoft October 2022 security updates for all affected Windows client and server versions; this is the primary fix.
• Prioritize patching of internet-facing and high-value servers and any host where untrusted users can run code.
• Enforce least privilege and restrict local logon and code execution rights to reduce the pool of accounts that can trigger the flaw.
• Monitor for and remove unpatched or end-of-life builds (for example Windows 7, 8.1, Server 2008/2012) that cannot receive the fix.
• Track KEV remediation deadlines and verify patch compliance across the affected product list.

Detection

• Alert on unexpected child processes of the COM+ Event System service (EventSystem) or svchost instances hosting it, especially those spawning cmd, powershell or other shells.
• Monitor for privilege escalation artifacts: processes gaining SYSTEM tokens, unusual service creation or modification, and suspicious named-pipe or COM object access.
• Correlate local logon events with subsequent high-integrity process creation on the same host to spot escalation chains.
• Hunt for known public proof-of-concept behavior tied to COM+ Event System abuse and review EDR telemetry for anomalous COM object instantiation.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.