Username Enumeration in VMware NSX Password Recovery Mechanism
CVE-2025-41251 is a high-severity vulnerability in VMware NSX caused by a weak password recovery mechanism. The flaw allows a remote, unauthenticated attacker to interact with the password recovery functionality and distinguish whether a supplied username is valid based on differing application responses. The supporting content indicates the enumeration may be observable through differences such as error messages, HTTP status codes, or timing behavior. This affects VMware NSX 9.x.x.x, 4.2.x, 4.1.x, 4.0.x, NSX-T 3.x, and VMware Cloud Foundation deployments that include affected NSX versions. The issue is classified as CWE-640 and has a CVSS v3 score of 8.1.
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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
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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
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity vulnerability in VMware NSX (details not provided in the content) for which Broadcom released patches.
A critical vulnerability in Broadcom VMware, details not specified in the content.
A high-severity unauthenticated username enumeration vulnerability in VMware NSX/NSX-T that enables reconnaissance to validate accounts, facilitating subsequent credential-based attacks and potential chaining to deeper compromise.
A high-severity VMware NSX vulnerability caused by a weakness in the password recovery mechanism that allows unauthenticated username enumeration.
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.