CVE-2025-48806 Overview
CVE-2025-48806 is a use-after-free vulnerability [CWE-416] in the Microsoft MPEG-2 Video Extension component shipped with Windows. An authorized local attacker can trigger the flaw during MPEG-2 media handling to execute arbitrary code in the context of the affected process. Microsoft disclosed the issue on July 8, 2025, and rates it 7.8 (High) under CVSS 3.1. The flaw impacts a broad matrix of Windows client and server releases, from legacy Windows Server 2008 through Windows 11 24H2 and Windows Server 2025.
Critical Impact
Successful exploitation allows local code execution with high impact to confidentiality, integrity, and availability on unpatched Windows systems running the MPEG-2 Video Extension.
Affected Products
- Microsoft Windows 10 (1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (22H2, 23H2, 24H2)
- Microsoft Windows Server 2008, 2012, 2012 R2, 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-07-08 - CVE-2025-48806 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-48806
Vulnerability Analysis
The vulnerability resides in the Microsoft MPEG-2 Video Extension, a media codec component used by Windows to decode MPEG-2 video streams. A use-after-free condition occurs when the component continues to reference memory that has already been released during video frame processing. An attacker who can execute code locally with low privileges can craft an MPEG-2 media stream or trigger a codec code path that manipulates the freed object before reallocation.
Once the dangling pointer is dereferenced, the attacker can influence the control flow of the process using the codec. This yields arbitrary code execution in the context of the compromised process. The advisory indicates no user interaction is required beyond the attacker's own local activity, and the scope remains unchanged.
Root Cause
The root cause is improper object lifetime management inside the MPEG-2 Video Extension [CWE-416]. Memory backing a codec object is freed, yet a pointer to that object remains in use. When the codec reaches the reuse path, the attacker's controlled contents occupy the freed allocation and hijack execution.
Attack Vector
Exploitation requires local access and low-privileged authentication on the target host. A typical path involves an attacker delivering a malicious MPEG-2 asset and inducing the vulnerable codec to process it, for example through a media application that invokes the extension. Detailed public exploit code is not currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Microsoft CVE-2025-48806 Advisory for vendor-provided technical details.
Detection Methods for CVE-2025-48806
Indicators of Compromise
- Unexpected crashes, faulting module entries, or Windows Error Reporting events tied to the MPEG-2 Video Extension or msmpeg2vdec.dll-adjacent codec libraries.
- Media player or codec host processes spawning shells (cmd.exe, powershell.exe) or writing executables to user-writable directories.
- Anomalous MPEG-2 (.mpg, .mpeg, .ts) files staged in user profile paths shortly before codec process instability.
Detection Strategies
- Hunt for parent-child process relationships where media applications launch scripting interpreters or LOLBins immediately after opening MPEG-2 content.
- Correlate application crash telemetry in the codec host with subsequent privileged operations on the same endpoint.
- Monitor loaded module events for the MPEG-2 Video Extension across sessions with low-privileged users on servers that should not decode media.
Monitoring Recommendations
- Ingest Windows Application, Security, and Sysmon logs into a centralized SIEM and alert on repeated faults in codec-hosting processes.
- Track installation and version state of the Microsoft MPEG-2 Video Extension across the fleet to identify unpatched or unnecessary installs.
- Alert on execution of media playback stacks by service or system accounts, which is uncommon in server environments.
How to Mitigate CVE-2025-48806
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft CVE-2025-48806 Advisory to all affected Windows client and server builds.
- Inventory endpoints and servers with the MPEG-2 Video Extension installed and prioritize patching multi-user systems and terminal servers.
- Restrict local logon and interactive session rights on servers to reduce the population of accounts that could exploit a local vulnerability.
Patch Information
Microsoft has issued security updates addressing CVE-2025-48806 for all supported Windows client and server versions listed in the advisory. Deploy the vendor updates through Windows Update, Windows Server Update Services (WSUS), Microsoft Intune, or Microsoft Endpoint Configuration Manager. Confirm patch installation by verifying updated component versions after reboot.
Workarounds
- Uninstall or disable the Microsoft MPEG-2 Video Extension on systems that do not require MPEG-2 playback, particularly servers.
- Block untrusted MPEG-2 media files at email and web proxy layers, and restrict end-user ability to download codec-triggering content from untrusted sources.
- Enforce standard-user privileges and application control policies (for example, Windows Defender Application Control) to limit which processes may load the codec.
# Example: remove the MPEG-2 Video Extension for the current user via PowerShell
Get-AppxPackage -Name "Microsoft.MPEG2VideoExtension" | Remove-AppxPackage
# Verify installed version after patching
Get-AppxPackage -Name "Microsoft.MPEG2VideoExtension" | Select-Object Name, Version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
