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VulnerabilityPublished Updated

CVE-2025-41251: vmware NSX · Weak Password Recovery

Affects vmware NSXSource CVE Database V5

0

Not known to be exploited · CVSS 8.1 High · fixed in 4.6.0 : patch vmware NSX soon.

Data as of 26 Oct 2026, 10:12 UTC

CVSS 3.1 base score
8.1High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.6.0, 4.3.0, 4.2.0 +1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade vmware NSX to 4.6.0, 4.3.0, 4.2.0 or 4.1.0.

Affected software

ProductAffectedFixed in
vmware NSXAffected
  • >=4.2.0 <4.3.0
  • >=4.1.0 <4.2.0
  • >=4.0.0 <4.1.0
  • >=4.5.0 <4.6.0
Fixed in
  • 4.3.0
  • 4.2.0
  • 4.1.0
  • 4.6.0

AI-suggested

  1. Immediately apply the official patches released by VMware for the affected NSX versions: NSX 9.0.1.0, 4.2.2.2/4.2.3.1, 4.1.2.7, NSX-T 3.2.4.3, and the Cloud Foundation async patch (KB88287).
  2. Restrict access to NSX management interfaces using network segmentation and firewall rules to limit exposure to trusted IP addresses only.
  3. Implement multi-factor authentication (MFA) on all NSX management accounts to reduce the risk of credential compromise even if brute-force attacks succeed.
  4. Monitor authentication logs and password recovery attempts for unusual activity indicative of username enumeration or brute-force attacks.
  5. Enforce strong password policies and consider account lockout thresholds to mitigate brute-force attack effectiveness.
  6. Conduct regular security assessments and penetration tests focusing on NSX environments to detect potential exploitation attempts.
  7. Educate administrators and security teams about this vulnerability and the importance of timely patching and monitoring.
  8. If immediate patching is not feasible, consider temporarily disabling password recovery features or restricting their access, if possible, until patches can be applied.

Description

VMware NSX contains a weak password recovery mechanism vulnerability. An unauthenticated malicious actor may exploit this to enumerate valid usernames, potentially enabling brute-force attacks. Impact: Username enumeration → credential brute force risk. Attack Vector: Remote, unauthenticated. Severity: Important. CVSSv3: 8.1 (High). Acknowledgments: Reported by the National Security Agency. Affected Products:VMware NSX 9.x.x.x, 4.2.x, 4.1.x, 4.0.x NSX-T 3.x VMware Cloud Foundation (with NSX) 5.x, 4.5.x Fixed Versions: NSX 9.0.1.0; 4.2.2.2/4.2.3.1 http://4.2.2.2/4.2.3.1 ; 4.1.2.7; NSX-T 3.2.4.3; CCF async patch (KB88287). Workarounds: None.

References

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