Windows TCP/IP Local Elevation of Privilege Vulnerability
CVE-2026-33837 is an Important local elevation of privilege vulnerability in the Windows TCP/IP component, specifically involving a heap-based buffer overflow in tcpip.sys. According to the provided content, an attacker with low privileges can exploit the flaw locally by running code and interacting with the tcpip.sys kernel driver. The issue does not require user interaction and is characterized by low attack complexity. Successful exploitation can result in escalation from a low-privileged context to kernel-level privileges on the affected Windows system.
Are you exposed to this one?
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An important Windows TCP/IP local elevation of privilege vulnerability that Microsoft determined is more likely to be exploited.
A heap-based buffer overflow in Windows TCP/IP that allows a local authorized attacker with low privileges to elevate to kernel-level privileges.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.