CVE-2021-26424
CriticalCVSS 9.9Exploitation Probability (EPSS)
Very high risk99th percentile - higher than 99% of all known CVEs
Summary
Remote code execution vulnerability in Windows TCP/IP stack. It could allow an attacker to execute arbitrary code in the context of the kernel.
Risk Assessment
An attacker could take control of the system without authentication, potentially leading to full system compromise.
Recommendation
Install the latest Windows security updates.
Other vulnerabilities in Windows TCP/IP
See all- CVE-2026-40415High
A use after free vulnerability in Windows TCP/IP allows an unauthorized attacker to execute code over a network.
- CVE-2026-40406High
A use after free vulnerability in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.
- CVE-2026-40405High
A null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over a network.
- CVE-2026-34351High
A race condition in Windows TCP/IP allows for concurrent execution using shared resources with improper synchronization. This enables an authorized attacker to elevate privileges locally.
- CVE-2026-34334High
A race condition in Windows TCP/IP allows for concurrent execution using shared resources with improper synchronization. This enables an authorized attacker to elevate privileges locally.
- CVE-2026-33837High
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
- CVE-2026-42904Critical
Heap-based buffer overflow in Windows TCP/IP allows an unauthorized attacker to elevate privileges over an adjacent network.
- CVE-2026-69793High
Improper validation of consistency within input in Windows TCP/IP allows an unauthorized attacker to bypass a security feature over a network.
- CVE-2026-69761High
Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network.
- CVE-2026-69757High
Use after free in Windows TCP/IP allows an authorized attacker to elevate privileges over a network.
Original NVD description (English source)
Windows TCP/IP Remote Code Execution Vulnerability