CVE-2020-36907: Aerohive HiveOS DoS Vulnerability

CVE-2020-36907 Overview

CVE-2020-36907 is a denial of service vulnerability affecting Aerohive HiveOS, specifically within the NetConfig UI web interface. This vulnerability allows unauthenticated remote attackers to render the web management interface completely unusable by sending crafted HTTP requests to the action.php5 script with specific parameters. When exploited, the attack triggers a 5-minute service disruption, effectively locking administrators out of the device's web-based management console.

The vulnerability is classified as CWE-770 (Allocation of Resources Without Limits or Throttling), indicating that the affected component fails to properly limit resource consumption when processing certain requests, making it susceptible to resource exhaustion attacks.

Critical Impact

Unauthenticated attackers can repeatedly trigger 5-minute denial of service conditions against the HiveOS web management interface, potentially blocking administrators from managing network infrastructure during critical periods.

Affected Products

• Aerohive HiveOS (NetConfig UI component)
• Extreme Networks HiveOS (following Extreme Networks' acquisition of Aerohive)

Discovery Timeline

• 2026-01-06 - CVE-2020-36907 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2020-36907

Vulnerability Analysis

This denial of service vulnerability resides in the NetConfig UI component of Aerohive HiveOS, specifically targeting the action.php5 script. The web interface fails to implement proper rate limiting or resource allocation controls, allowing attackers to consume system resources through malformed or repeated requests.

The attack requires no authentication, significantly lowering the barrier for exploitation. An attacker with network access to the management interface can craft specific HTTP requests that trigger the denial of service condition. Once triggered, the web interface becomes unresponsive for approximately 5 minutes, after which service typically resumes until another attack is initiated.

The network-based attack vector combined with low attack complexity means that any attacker with visibility to the HiveOS management interface can exploit this vulnerability. The impact is limited to availability—there is no indication of data confidentiality or integrity compromise through this vulnerability.

Root Cause

The root cause stems from improper resource allocation within the action.php5 script handler. The application fails to validate or throttle incoming requests appropriately, allowing attackers to exhaust available resources. This falls under CWE-770 (Allocation of Resources Without Limits or Throttling), where the software allocates reusable resources without implementing controls to prevent excessive consumption by malicious actors.

Attack Vector

The attack is conducted over the network against the HiveOS web management interface. Attackers send crafted HTTP requests targeting the action.php5 endpoint with specific parameters designed to trigger the resource exhaustion condition. The attack requires:

• Network access to the HiveOS management interface
• No authentication credentials
• Knowledge of the vulnerable endpoint and parameter combination

The exploitation process involves sending malicious HTTP requests to the action.php5 script. When the vulnerable parameters are processed, the system enters a state where the web interface becomes unresponsive for approximately 5 minutes. Technical details regarding the specific payload structure can be found in the Zero Science Vulnerability Report ZSL-2020-5566 and the Exploit-DB #48441 entry.

Detection Methods for CVE-2020-36907

Indicators of Compromise

• Unusual volume of HTTP requests targeting action.php5 on HiveOS management interfaces
• Repeated web interface unavailability periods lasting approximately 5 minutes
• Network traffic patterns showing crafted requests with exploit-specific parameters
• Administrator reports of management interface accessibility issues during suspected attack windows

Detection Strategies

• Monitor HTTP access logs for requests to action.php5 with abnormal parameters or frequency
• Implement network-based detection rules to identify known exploit signatures from published proof-of-concept code
• Configure alerts for web service unavailability on HiveOS devices
• Deploy intrusion detection signatures based on the IBM X-Force Vulnerability Report indicators

Monitoring Recommendations

• Establish baseline metrics for management interface response times and availability
• Configure SNMP or other monitoring protocols to detect HiveOS web service interruptions
• Review access logs regularly for requests originating from unexpected network segments
• Implement network segmentation to limit exposure of management interfaces

How to Mitigate CVE-2020-36907

Immediate Actions Required

• Restrict network access to HiveOS management interfaces to trusted administrator networks only
• Implement firewall rules to block external access to the web management interface
• Configure VPN or jump host requirements for remote management access
• Monitor the Extreme Networks Announcement Blog for security updates

Patch Information

Organizations should consult Extreme Networks (who acquired Aerohive) for available security patches. Review the NCSC Security Advisory 2020-0367 and the VulnCheck Advisory for Extreme Networks for detailed remediation guidance and patch availability information.

Workarounds

• Place HiveOS management interfaces behind a reverse proxy with rate limiting capabilities
• Implement IP allowlisting to restrict management interface access to known administrator IP addresses
• Use out-of-band management networks isolated from general network traffic
• Consider temporary disabling of the web interface if alternative management methods (SSH, console) are available during high-risk periods

# Example firewall rule to restrict management interface access (iptables)
# Restrict access to HiveOS web management port to trusted admin network only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP