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CVE-2025-41237 is an integer-underflow vulnerability in the VMCI (Virtual Machine Communication Interface) component of VMware ESXi, Workstation, and Fusion. Improper validation of user-supplied data can cause an integer underflow prior to a memory write, resulting in an out-of-bounds write condition. A malicious actor with local administrative privileges inside a guest virtual machine can exploit the flaw to execute code in the context of the virtual machine's VMX process on the host. On ESXi, exploitation is stated to be contained within the VMX sandbox. On Workstation and Fusion, successful exploitation may result in code execution on the underlying host system where the product is installed.
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What an attacker gets, and what they’ve been doing with it.
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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.
11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer underflow vulnerability in the VMCI component in VMware products that can enable out-of-bounds writes and potentially lead to host code execution.
A critical VMware vulnerability listed in the advisory as affecting multiple VMware products; the specific technical details for this CVE are not separately described in the content.
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.