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CVE-2025-22225 is an arbitrary write vulnerability in VMware ESXi. A malicious actor with privileges within the VMX process can trigger an arbitrary write to kernel memory, resulting in escape from the VMX sandbox into the ESXi kernel context. The flaw is part of a broader VM-escape attack surface affecting ESXi and has been reported as chainable with CVE-2025-22224 and CVE-2025-22226, where memory disclosure and VMX-process compromise can be used to reach the prerequisite VMX privileges needed for the kernel write. Successful exploitation breaks guest-to-host isolation and enables compromise of the hypervisor from a guest VM context.
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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.
57 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A VMware vulnerability mentioned only in historical advisory context as one of the March 2025 zero-days.
A VMware VM escape chain involving HGFS and VMCI interfaces that allows code execution on the hypervisor from a compromised guest VM.
A VMware ESXi vulnerability enabling sandbox escape via VMX-related flaws, reported by CISA as exploited in ransomware attacks.
A specific vulnerability in VMware ESXi that the newsletter states is being leveraged in active ransomware attacks.
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.