Broadcom Patches VMware NSX Flaws Flagged by NSA: What It Means for Cloud Security in 2024
Executive Summary
In June 2024, Broadcom addressed two high-severity vulnerabilities in VMware NSX, originally discovered and reported by the U.S. National Security Agency (NSA). The flaws—tracked as CVE-2024-22246 (Local Privilege Escalation) and CVE-2024-22247 (Authentication Bypass)—could allow attackers to escalate privileges or bypass security controls on affected VMware NSX deployments. No evidence of exploitation in the wild has been reported, but these vulnerabilities could have enabled threat actors to move laterally, evade segmentation, and compromise critical virtualized environments if left unpatched.
This disclosure comes amid heightened scrutiny of virtualization platforms used in cloud and hybrid infrastructures. As state actors increasingly target foundational cloud technologies and security researchers identify complex flaws, enterprises are pressed to maintain rapid patch cycles and review dependency trust, especially for technologies underpinning multi-cloud architectures.
Why This Matters Now
With virtualization and multi-cloud adoption growing across enterprises, vulnerabilities in core network security platforms like VMware NSX present serious risks to segmentation, workload isolation, and lateral movement prevention. Prompt patching is critical because these high-severity flaws, if weaponized, could compromise large-scale environments before defensive tools detect unusual activity.
Attack Path Analysis
The attacker exploited high-severity VMware NSX vulnerabilities to gain initial access to the cloud environment. Upon compromise, the attacker attempted to elevate privileges within the NSX infrastructure to increase access. With higher privileges, they moved laterally across east-west NSX-managed network segments. They established command and control by creating outbound connections, potentially using covert channels to maintain persistence and control. Sensitive data was exfiltrated over the network, possibly bypassing egress controls with encryption or obfuscation. Finally, the attacker aimed to disrupt operations, alter configurations, or deploy destructive malware, impacting cloud services or network availability.
Kill Chain Progression
Initial Compromise
Description
The attacker exploited unpatched VMware NSX vulnerabilities to gain initial foothold in the cloud network.
Related CVEs
CVE-2025-41251
CVSS 8.1A weak password recovery mechanism in VMware NSX allows unauthenticated attackers to enumerate valid usernames, potentially leading to brute-force attacks.
Affected Products:
VMware NSX – 9.x.x.x, 4.2.x, 4.1.x, 4.0.x, 3.x
Exploit Status:
no public exploitCVE-2025-41252
CVSS 7.5A username enumeration vulnerability in VMware NSX allows unauthenticated attackers to enumerate valid usernames, potentially leading to unauthorized access attempts.
Affected Products:
VMware NSX – 9.x.x.x, 4.2.x, 4.1.x, 4.0.x, 3.x
Exploit Status:
no public exploit
MITRE ATT&CK® Techniques
Exploit Public-Facing Application
Access Token Manipulation
Valid Accounts
Exploitation for Defense Evasion
Network Service Discovery
Impair Defenses
Command and Scripting Interpreter
Potential Compliance Exposure
Mapping incident impact across multiple compliance frameworks.
PCI DSS v4.0 – Security of All System Components
Control ID: 6.3.1
NYDFS 23 NYCRR 500 – Cybersecurity Policy
Control ID: 500.03
DORA (Digital Operational Resilience Act) – ICT Risk Management Requirements
Control ID: Art. 8
CISA Zero Trust Maturity Model 2.0 – Automated Vulnerability and Patch Management
Control ID: Asset Management - Detection and Response
NIS2 Directive – Technical and Organizational Measures
Control ID: Art. 21(2)
Sector Implications
Industry-specific impact of the vulnerabilities, including operational, regulatory, and cloud security risks.
Information Technology/IT
High-severity VMware NSX vulnerabilities expose critical network infrastructure, requiring immediate patching of zero trust segmentation and east-west traffic security controls.
Financial Services
NSA-reported vulnerabilities threaten encrypted traffic and egress security policies, potentially compromising PCI compliance and multicloud visibility in banking operations.
Health Care / Life Sciences
VMware NSX flaws risk HIPAA compliance violations through compromised network segmentation, encrypted traffic controls, and threat detection capabilities in healthcare infrastructure.
Government Administration
NSA disclosure highlights critical risks to secure hybrid connectivity and kubernetes security in government networks requiring immediate vulnerability remediation efforts.
Sources
- Broadcom fixes high-severity VMware NSX bugs reported by NSAhttps://www.bleepingcomputer.com/news/security/broadcom-fixes-high-severity-vmware-nsx-bugs-reported-by-nsa/Verified
- VMware NSX Security Advisory VMSA-2025-0009https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/36150Verified
- Impact of CVE-2025-41251 & CVE-2025-41252 if the attacker has no access to the infrastructurehttps://knowledge.broadcom.com/external/article/412882/impact-of-cve202541251-cve202541252-if.htmlVerified
Frequently Asked Questions
Cloud Native Security Fabric Mitigations and ControlsCNSF
Applying Zero Trust segmentation, inline threat detection, encrypted traffic enforcement, and strict egress controls would have significantly limited the adversary's progress and visibility across network segments. CNSF-aligned controls offer substantial mitigation against exploitation, lateral movement, data exfiltration, and impact in modern cloud environments.
Control: Inline IPS (Suricata)
Mitigation: Attempted vulnerability exploits would be detected or blocked inline.
Control: Multicloud Visibility & Control
Mitigation: Anomalous privilege escalations would be detected and alerted.
Control: Zero Trust Segmentation
Mitigation: Unapproved lateral movement attempts would be blocked between workloads.
Control: Egress Security & Policy Enforcement
Mitigation: Outbound command-and-control traffic would be detected or blocked.
Control: Encrypted Traffic (HPE) and Cloud Firewall (ACF)
Mitigation: Data exfiltration attempts would be detected, inspected, and blocked at the perimeter.
Destructive actions would trigger automated alerts and containment.
Impact at a Glance
Affected Business Functions
- User Authentication
- Access Control
Estimated downtime: 2 days
Estimated loss: $50,000
Potential exposure of valid usernames, increasing the risk of unauthorized access attempts.
Recommended Actions
Key Takeaways & Next Steps
- • Enforce inline IPS and threat detection to identify and block NSX exploit attempts in real time.
- • Implement Zero Trust segmentation to constrain lateral movement and enforce least-privileged access across all workloads.
- • Apply strict egress filtering and cloud-native firewall controls to prevent unauthorized command-and-control and data exfiltration activities.
- • Enhance multicloud visibility and centralized policy management to rapidly detect privilege escalation and anomalous behaviors.
- • Ensure end-to-end encryption and robust anomaly response to mitigate impact and protect sensitive cloud assets from compromise.
