CVE-2021-34503
HighCVSS 7.8Exploitation Probability (EPSS)
High risk80th percentile - higher than 80% of all known CVEs
Summary
Remote code execution vulnerability in Microsoft Windows Media Foundation. An attacker could exploit this flaw to execute code on the victim's system.
Risk Assessment
Risk of system compromise when a user opens a malicious media file.
Recommendation
Install the latest security update for Windows Media Foundation.
Other vulnerabilities in Microsoft Windows Media Foundation
See all- CVE-2026-96952High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-96186High
A deserialization of untrusted data vulnerability in Microsoft Windows Media Foundation allows an authenticated attacker to elevate privileges locally. The flaw arises from unsafe deserialization of untrusted data.
- CVE-2026-70278High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an authorized attacker to elevate privileges locally.
- CVE-2026-70258High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-70131High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to elevate privileges locally.
- CVE-2026-85814Critical
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-83517Critical
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-69408Critical
Integer overflow or wraparound in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-69601High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
- CVE-2026-62744High
Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.
Original NVD description (English source)
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
Vulnerability data from NVD (NIST) · CISA KEV · EPSS