CVE-2022-33680: Microsoft Edge Privilege Escalation Flaw

CVE-2022-33680 Overview

CVE-2022-33680 is an elevation of privilege vulnerability affecting Microsoft Edge (Chromium-based). The flaw allows a remote attacker to escalate privileges within the browser context when a target user is convinced to perform a specific action. Exploitation requires user interaction and high attack complexity, but successful attacks can compromise confidentiality, integrity, and availability across security scopes. Microsoft addressed the issue through the standard Edge update channel.

Critical Impact

A successful attacker can elevate privileges within the Edge browser, breaking the boundary between web content and higher-privileged browser components, leading to compromise of user data and host resources.

Affected Products

• Microsoft Edge (Chromium-based) prior to the fixed release
• Windows installations running vulnerable Edge versions
• macOS installations running vulnerable Edge versions

Discovery Timeline

• 2022-07-07 - CVE-2022-33680 published to the National Vulnerability Database
• 2025-01-02 - Last updated in NVD database

Technical Details for CVE-2022-33680

Vulnerability Analysis

CVE-2022-33680 is classified as an elevation of privilege issue in Microsoft Edge built on the Chromium engine. The CVSS vector indicates a network-based attack path that requires user interaction and crosses a security scope boundary on success. This scope change is characteristic of browser sandbox or renderer-to-broker escalations, where code constrained to one privilege domain influences another. Microsoft has not published detailed root cause information beyond classifying the issue as elevation of privilege, and the NVD entry uses NVD-CWE-noinfo for the weakness category.

The high attack complexity rating suggests that exploitation depends on specific conditions, such as winning a race, defeating mitigations, or chaining additional primitives. The EPSS probability of 1.481% places this vulnerability in the 81st percentile, indicating meaningful real-world exploitation interest relative to the broader CVE population.

Root Cause

Microsoft has not publicly disclosed the specific defective component or function. The advisory categorizes the issue as elevation of privilege within Edge Chromium, consistent with flaws in inter-process communication, permission enforcement, or content isolation logic in the browser.

Attack Vector

An attacker hosts or injects malicious web content that the victim must load in a vulnerable Edge instance. User interaction is required, such as visiting an attacker-controlled page or clicking a crafted element. Successful exploitation elevates the attacker's privileges from the constrained web content context to a higher-privileged browser scope.

No public proof-of-concept exploit code is available for this vulnerability. Refer to the Microsoft Security Advisory CVE-2022-33680 for vendor-supplied technical details.

Detection Methods for CVE-2022-33680

Indicators of Compromise

• Edge browser processes spawning unexpected child processes such as cmd.exe, powershell.exe, or scripting hosts shortly after a browsing session.
• Anomalous file writes or registry modifications originating from msedge.exe outside its normal cache and profile paths.
• Outbound network connections from Edge renderer or broker processes to previously unseen domains following user navigation to untrusted sites.

Detection Strategies

• Inventory installed Edge versions across the fleet and flag endpoints running builds released before the fix.
• Hunt for browser-initiated process trees that deviate from baseline behavior, particularly process injection or token manipulation events tied to msedge.exe.
• Correlate web proxy logs with endpoint telemetry to identify users visiting suspicious sites immediately before privilege-related events.

Monitoring Recommendations

• Enable browser telemetry forwarding to a centralized log platform and retain process creation events with full command lines.
• Monitor Edge auto-update health and alert when devices fall behind the current stable channel.
• Track creation of new scheduled tasks, services, or persistence entries that follow browsing activity.

How to Mitigate CVE-2022-33680

Immediate Actions Required

• Apply the Microsoft Edge update referenced in the Microsoft vendor advisory to all Windows and macOS endpoints.
• Confirm Edge auto-update is enabled and not blocked by group policy or network egress restrictions.
• Restart Edge after patching to ensure the updated binaries are loaded into all browser processes.

Patch Information

Microsoft released a fixed version of Edge (Chromium-based) through the standard browser update channel. Administrators should consult the Microsoft Security Response Center advisory for the exact build numbers corresponding to the fix and deploy through Microsoft Edge Update, Intune, or equivalent management tooling.

Workarounds

• Restrict browsing to trusted sites using web filtering or DNS-layer controls until patches are deployed.
• Enforce least-privilege user accounts so that any successful browser-context elevation has limited impact on the underlying host.
• Disable or limit risky browser features such as unnecessary extensions and legacy content handlers in environments that cannot patch immediately.

# Verify the installed Microsoft Edge version on Windows
reg query "HKLM\SOFTWARE\Microsoft\Edge\BLBeacon" /v version

# Force an Edge update check via the Edge Update service
"%PROGRAMFILES(X86)%\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe" /ua /installsource scheduler