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How CVE-2025-29840 Works
CVE-2025-29840 is a critical stack-based buffer overflow vulnerability in Windows Media components. The flaw occurs when processing malformed media files or streams, where improper bounds checking allows overwriting the stack memory. An attacker can craft a malicious media file or transmit a specially crafted network stream, triggering the overflow. This leads to arbitrary code execution with the privileges of the application processing the media (often SYSTEM-level). The vulnerability is remotely exploitable without authentication, making it highly dangerous for unpatched systems.
DailyCVE Form
Platform: Windows Media
Version: Windows 10/11, Server 2019/2022
Vulnerability: Stack overflow
Severity: Critical
Date: 06/23/2025
Prediction: Patch by 07/15/2025
What Undercode Say
Analytics:
Get-WindowsFeature | Where-Object { $_.Name -like "Media" }
wmic qfe list full | findstr "KB5005565"
Exploit:
payload = b"\x41" 2048 + struct.pack("<I", 0xdeadbeef)
send_media_packet(target_ip, payload)
Protection from this CVE:
– Disable Windows Media services
– Apply Microsoft patch (when released)
– Block SMB/HTTP media streaming
Impact:
– Remote code execution
– SYSTEM privilege escalation
– Wormable propagation
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
