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CVE-2026-33837 is a heap-based buffer overflow in the Windows TCP/IP kernel driver, tcpip.sys. The flaw can be triggered by a locally running low-privileged process that sends crafted input to the vulnerable kernel component, causing a write beyond a heap-allocated kernel buffer. This memory corruption condition can corrupt adjacent kernel heap structures and enable arbitrary code execution in kernel mode. The vulnerability affects a broad range of supported Windows client and server platforms and was addressed by Microsoft in the May 2026 security updates.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
3 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.
A heap-based buffer overflow privilege escalation vulnerability in the Windows TCP/IP kernel driver (tcpip.sys) that can allow a low-privileged local user to achieve kernel-level code execution and full system control.
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.