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CVE-2025-41252 is a remote, unauthenticated username enumeration vulnerability in VMware NSX and NSX-T. The flaw resides in NSX authentication handling on management interfaces, including web and API login paths, where observable differences in responses for valid versus invalid usernames can disclose whether an account exists. Reported discrepancies may include differing error behavior, status handling, or timing, allowing an attacker to automate probes against candidate usernames. Affected products include VMware NSX 9.x.x.x, 4.2.x, 4.1.x, and 4.0.x; NSX-T 3.x; and VMware Cloud Foundation deployments that include affected NSX components. The vulnerability is an information disclosure issue that supports reconnaissance against identity surfaces and can be used to prepare follow-on credential attacks.
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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.
17 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 high-severity VMware NSX vulnerability that can be exploited without authentication to enumerate user accounts, enabling follow-on brute-force or dictionary attacks that could lead to unauthorized access.
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 supports account discovery and can be chained with credential attacks and other flaws to progress from unauthenticated recon to authenticated compromise.
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.