CVE-2026-47865: VMware Avi Load Balancer Authentication Bypass - What It Means for Your Business and How to Respond

A critical authentication bypass in VMware Avi Load Balancer, tracked as CVE-2026-47865, gives an attacker with network access the ability to reach the Avi Control Plane without credentials. Organizations across the United States and Canada that rely on Avi for application delivery, load balancing, and multi-cloud traffic management face elevated risk of unauthorized configuration changes, traffic diversion, and broader infrastructure compromise. This post explains why the issue matters to business leaders, outlines who is most exposed, and provides clear guidance on assessing impact and taking action. Technical details appear only in the appendix for security and IT teams.

Background & History

Broadcom disclosed CVE-2026-47865 on July 14, 2026, as part of VMSA-2026-0005 covering multiple issues in VMware Avi Load Balancer. The vulnerability was published to the National Vulnerability Database on July 18, 2026, and last updated on July 23, 2026. It affects Avi Load Balancer versions 31.1.1 through 31.2.2, 30.1.1 through 30.2.6, and 22.1.1 through 22.1.7. The issue is an authentication bypass that allows a malicious actor with network access to reach the Avi Control Plane without valid credentials. Broadcom assigned a CVSS v3.1 base score of 9.8 (Critical). The flaw was reported by Filip Waeytens of NATO NCSC. Fixed versions are 31.2.2-2p3 for the 31.x branch and 30.2.7 for the 30.x and 22.x branches. No workarounds exist; upgrading is the only remediation path.

What This Means for Your Business

If your organization uses VMware Avi Load Balancer to distribute application traffic, this vulnerability can let an outsider take control of the central management layer that governs virtual services, server pools, SSL certificates, and routing policies. Unauthorized access can disrupt operations by altering traffic paths, taking applications offline, or redirecting users. Sensitive configuration data and potentially linked credentials become exposed, raising the chance of data leakage or further lateral movement. Reputation damage follows quickly if customers experience outages or learn that core infrastructure was compromised. In regulated sectors common across the U.S. and Canada, such as finance, healthcare, and government contracting, the incident can trigger reporting obligations under frameworks that require prompt notification of security events affecting critical systems. Even without confirmed exploitation at disclosure, the combination of network reachability, no authentication requirement, and high impact makes rapid response essential for protecting uptime, customer trust, and compliance posture.

Real-World Examples

Regional financial institution: A mid-sized bank running Avi to balance traffic for online banking portals experiences unauthorized changes to virtual service policies. Customer sessions are disrupted during peak hours, online transactions fail, and the institution must issue customer notifications while regulators inquire about the control failure.

Healthcare provider network: A multi-site clinic system uses Avi across hybrid cloud environments to manage electronic health record access. An attacker reaches the control plane and alters backend pool membership, causing intermittent outages that delay clinician access to patient records and create audit findings under privacy rules.

Mid-market e-commerce retailer: An online retailer relies on Avi for high-volume product catalog and checkout services. Control-plane access allows an adversary to redirect traffic or disable security policies, resulting in lost sales during a promotional period and subsequent investigation costs that strain the operating budget.

Managed service provider serving Canadian enterprises: A provider hosting Avi Controllers for multiple clients discovers the vulnerability after an external scan. One exposed controller leads to configuration tampering that affects several customer applications, forcing simultaneous notifications and emergency remediation across accounts.

Am I Affected?

• You are running VMware Avi Load Balancer version 31.1.1 through 31.2.2.
• You are running VMware Avi Load Balancer version 30.1.1 through 30.2.6.
• You are running VMware Avi Load Balancer version 22.1.1 through 22.1.7.
• Your Avi Controller management interface is reachable from untrusted networks, the internet, or broad internal segments.
• You have not yet upgraded to 31.2.2-2p3 (for 31.x) or 30.2.7 (for 30.x and 22.x branches).
• You manage hybrid or multi-cloud application delivery with Avi and cannot immediately confirm the installed version across all Controllers.

Key Takeaways

• CVE-2026-47865 is a critical authentication bypass that grants unauthenticated network access to the Avi Control Plane.
• Business impact centers on operational disruption, potential data exposure, reputational harm, and compliance exposure for organizations using affected Avi versions.
• Real-world scenarios span finance, healthcare, retail, and service providers, illustrating how control-plane compromise quickly affects customers and operations.
• Confirmation of affected versions and network exposure is the first practical step every business owner or IT leader should complete.
• Immediate upgrade to the fixed releases is the only complete remediation; network restrictions provide limited interim protection.

Call to Action

Confirm whether your Avi Controllers are running affected versions and prioritize the official upgrades. For a thorough assessment of exposure, configuration hygiene, and residual risk across your application delivery infrastructure, contact IntegSec. Our penetration testing team helps organizations in the United States and Canada identify and reduce cybersecurity risk with practical, prioritized recommendations. Visit https://integsec.com to schedule a conversation and strengthen your defenses.

TECHNICAL APPENDIX (security engineers, pentesters, IT professionals only)

A — Technical Analysis

CVE-2026-47865 is an improper authentication vulnerability (CWE-287) in the VMware Avi Load Balancer Controller. The root cause allows a remote attacker with network access to the management interface to bypass the authentication mechanism entirely and obtain access to the Avi Control Plane. The attack vector is network (AV:N), attack complexity is low (AC:L), privileges required are none (PR:N), and user interaction is none (UI:N). Scope is unchanged (S:U), with high impact to confidentiality, integrity, and availability (C:H/I:H/A:H). The CVSS v3.1 vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H, scoring 9.8 Critical. NVD reference: https://nvd.nist.gov/vuln/detail/CVE-2026-47865. Affected component is the Avi Controller authentication handling across the listed version ranges. No public technical root-cause details beyond the authentication bypass description have been released by the vendor.

B — Detection & Verification

[BOTH] Version enumeration can be performed via the Avi Controller web interface under System or Administration settings, or through the Avi CLI/API by querying the cluster version. Confirm whether the installed build falls within 31.1.1–31.2.2, 30.1.1–30.2.6, or 22.1.1–22.1.7.

Scanner signatures from commercial vulnerability scanners and open-source tools that fingerprint Avi Controllers can flag the presence of vulnerable version strings.

Log indicators include unexpected successful authentication or session establishment events originating from unauthorized source addresses, or access to control-plane APIs without corresponding prior login records.

Behavioral anomalies include sudden configuration changes, creation of new admin users, or modifications to virtual services and pools that lack corresponding change-management tickets.

Network exploitation indicators include unsolicited connections to the Avi Controller management ports (commonly HTTPS on the configured management IP) from external or untrusted internal segments, especially when followed by configuration API activity.

C — Mitigation & Remediation

1. Immediate (0–24h): Identify all Avi Controllers and determine their exact versions. Restrict network access to Controller management interfaces to trusted administrative networks only using firewall rules or network segmentation. Monitor authentication and configuration-change logs for anomalous activity.
2. Short-term (1–7d): Upgrade Controllers to the fixed versions: 31.2.2-2p3 for the 31.x branch, or 30.2.7 for the 30.x and 22.x branches, following Broadcom’s official upgrade procedures. Validate functionality after upgrade and review recent configuration changes for unauthorized modifications.
3. Long-term (ongoing): Maintain Controllers on supported, patched releases. Enforce strict network segmentation so that management interfaces are never reachable from untrusted zones. Integrate version and exposure checks into regular vulnerability management and external attack-surface monitoring processes. Broadcom has stated that no workarounds exist; patching is the sole complete remediation.

D — Best Practices

• Limit management-plane reachability of load-balancer Controllers to dedicated administrative networks and jump hosts only.
• Maintain an accurate inventory of all Avi Controller versions and apply vendor security updates promptly.
• Enable and regularly review detailed authentication and configuration-change logging with alerting on anomalous sources.
• Apply the principle of least privilege to administrative accounts and require multi-factor authentication where supported.
• Include application delivery controllers in periodic external and internal penetration tests focused on authentication and authorization weaknesses.