CVE-2025-37124: HPE Aruba SD-WAN Firewall Bypass Flaw

CVE-2025-37124 Overview

A vulnerability in the HPE Aruba Networking SD-WAN Gateways could allow an unauthenticated remote attacker to bypass firewall protections. Successful exploitation could allow an attacker to route potentially harmful traffic through the internal network, leading to unauthorized access or disruption of services.

Critical Impact

Unauthenticated attackers can bypass firewall protections to route malicious traffic through internal networks, potentially causing unauthorized access or service disruption.

Affected Products

• HPE Aruba Networking SD-WAN Gateways

Discovery Timeline

• 2025-09-16 - CVE CVE-2025-37124 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-37124

Vulnerability Analysis

This vulnerability is classified under CWE-693 (Protection Mechanism Failure), indicating a fundamental flaw in the security protection mechanisms implemented within HPE Aruba Networking SD-WAN Gateways. The vulnerability allows unauthenticated remote attackers to circumvent firewall protections that should otherwise prevent unauthorized network traffic from traversing the gateway.

The firewall bypass vulnerability represents a significant security concern for enterprise networks relying on SD-WAN gateways as a critical security boundary. When exploited, attackers can effectively neutralize the protective capabilities of the gateway, allowing potentially malicious traffic to pass through unfiltered and undetected.

Root Cause

The root cause of this vulnerability lies in a protection mechanism failure within the HPE Aruba Networking SD-WAN Gateway's firewall implementation. This type of vulnerability typically occurs when security controls fail to properly validate, authenticate, or authorize network traffic before allowing it to traverse the protected boundary. The gateway's firewall rules or enforcement logic may contain flaws that allow specially crafted traffic to bypass intended security policies.

Attack Vector

This vulnerability is exploitable remotely over the network without requiring authentication or user interaction. An attacker can craft malicious network traffic designed to evade the firewall's protection mechanisms, effectively bypassing security controls meant to filter and block unauthorized communications.

The attack can be initiated from any network location with connectivity to the vulnerable SD-WAN gateway. Once the firewall bypass is achieved, the attacker can:

• Route potentially harmful traffic through the internal network infrastructure
• Gain unauthorized access to protected network segments
• Disrupt legitimate services by introducing malicious traffic flows
• Establish footholds for further network penetration

Detection Methods for CVE-2025-37124

Indicators of Compromise

• Unusual network traffic patterns traversing SD-WAN gateways that would normally be blocked by firewall rules
• Unexpected connections to internal network segments from external sources
• Anomalous traffic flows that bypass expected security policy enforcement
• Log entries showing firewall rule bypasses or policy violations

Detection Strategies

• Monitor SD-WAN gateway logs for anomalous traffic patterns that should have been blocked
• Implement network flow analysis to detect traffic that bypasses expected security boundaries
• Deploy intrusion detection systems (IDS) on internal network segments to identify traffic that should not have passed firewall controls
• Correlate firewall logs with actual network traffic to identify discrepancies in enforcement

Monitoring Recommendations

• Enable comprehensive logging on HPE Aruba SD-WAN Gateways and forward logs to centralized SIEM
• Implement real-time alerting for traffic anomalies that suggest firewall bypass attempts
• Conduct regular audits of firewall rule effectiveness by comparing expected versus actual traffic patterns
• Monitor for reconnaissance activities that may precede exploitation attempts

How to Mitigate CVE-2025-37124

Immediate Actions Required

• Review the HPE Security Document for vendor-specific guidance and patches
• Assess exposure of HPE Aruba Networking SD-WAN Gateways to untrusted networks
• Implement additional network segmentation to limit potential impact of firewall bypass
• Enable enhanced logging and monitoring on affected devices pending patch deployment

Patch Information

HPE has published a security advisory addressing this vulnerability. Administrators should consult the HPE Security Document for detailed patch information, affected version details, and upgrade instructions. Apply vendor-provided security updates as soon as they are available and tested in your environment.

Workarounds

• Implement additional perimeter security controls upstream of affected SD-WAN gateways
• Deploy network access control lists (ACLs) on adjacent network devices to provide defense-in-depth
• Consider temporarily restricting external access to affected gateways until patches can be applied
• Implement network segmentation to contain potential impact if firewall bypass occurs

# Example: Review HPE Aruba SD-WAN Gateway firewall configuration
# Consult HPE documentation for device-specific commands
# Ensure logging is enabled for all firewall rule actions
# Verify firmware version against HPE security advisory