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MSRC compact vulnerability detail

CVE-2026-33837 · Windows TCP/IP Local Elevation of Privilege Vulnerability

Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Severity
Important
Impact
Elevation of Privilege
CVSS
7.8 base · 6.8 temporal
Release
2026-05-12
Signals
Windows TCP/IP Elevation of Privilege Exploited: No Publicly disclosed: No Exploitability: Exploitation More Likely
CWE
CWE-122: Heap-based Buffer Overflow
Patch Diff
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Description
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
FAQ / Articles
Windows TCP/IP Elevation of Privilege Vulnerability
Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.
FAQ
How could an attacker exploit this vulnerability? An attacker could exploit this vulnerability locally by running code with limited privileges and then interacting with the tcpip.sys kernel driver to gain elevated (kernel-level) privileges on the system.