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CVE-2025-41236 is an integer-overflow vulnerability in the VMXNET3 virtual network adapter implementation used by VMware ESXi, Workstation, and Fusion. The flaw is caused by improper validation of user-supplied data in the VMXNET3 virtual device, which can trigger an integer overflow prior to buffer allocation. An attacker who has local administrative or otherwise high-privileged code execution within a guest virtual machine configured with the VMXNET3 adapter can exploit the condition to corrupt memory and achieve code execution in the context of the host hypervisor. Virtual machines using non-VMXNET3 virtual network adapters are not affected.
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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.
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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.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer overflow vulnerability in the VMXNET3 network adapter in VMware products that can allow code execution on the host from a compromised virtual machine.
An integer-overflow vulnerability in the VMXNET3 virtual network adapter affecting VMware ESXi, Workstation, and Fusion that could allow code execution on the host from a guest VM with local administrative privileges.
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.