Netgear Wireless Access Point Remote Command Execution Vulnerability Analysis and Mitigation Guide (CVE-2016-1555)
Executive & SecOps Summary
SECOPS ASSESSMENTNetgear WN604 (before 3.3.3) and WN802Tv2, WNAP210v2, WNAP320, WNDAP350, WNDAP360, WNDAP660 (before 3.5.5.0)
Unauthenticated remote attackers can execute arbitrary system commands with root privileges by sending crafted HTTP requests
Apply the official firmware updates immediately, or restrict access to the web management interface from untrusted networks
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Download and apply the latest secure firmware version (3.3.3 or higher for WN604; 3.5.5.0 or higher for other models) from the official Netgear Support portal.
2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict access to the web management interface. Use firewall rules to block external access to the AP's HTTP/HTTPS ports. Below is an example of an iptables rule to block external access to the target AP:
# Block external access (via eth0) to the AP's web interface (e.g., IP 192.168.1.100)
iptables -A FORWARD -i eth0 -d 192.168.1.100 -p tcp -m multiport --dports 80,443 -j DROP3. Log Audit & IoC Verification Commands
Audit your web server access logs or network traffic for suspicious requests targeting the vulnerable PHP files. You can use the following command to search for potential exploitation attempts:
# Search web server access logs for requests targeting the vulnerable PHP endpoints
egrep -i 'boardData(102|103|JP|NA|WW)\.php' /var/log/nginx/access.log /var/log/apache2/access.log 2>/dev/nullStop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
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Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2016-1555) is a critical command injection flaw (CWE-77) residing in multiple PHP scripts of Netgear Wireless Access Point (AP) web management interfaces. The affected scripts include boardData102.php, boardData103.php, boardDataJP.php, boardDataNA.php, and boardDataWW.php. The root cause is the lack of proper input validation and sanitization on user-supplied parameters before passing them to system shell execution functions.
2. Exploitation Mechanics & Attack Scenario
An attacker with network access to the device's web administration interface can send a crafted HTTP request targeting one of the vulnerable PHP endpoints. By embedding shell metacharacters (such as ';', '|', or '`') into the parameters, the attacker bypasses authentication and forces the underlying operating system to execute arbitrary commands. Public exploits and automated scanning tools have been observed leveraging this vulnerability in the wild.
3. Infrastructure & Business Impact
With a CVSS score of 9.8 (Critical) and its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog, this vulnerability poses a severe threat. Successful exploitation grants full administrative control over the AP, allowing attackers to intercept network traffic, perform Man-in-the-Middle (MitM) attacks, or pivot deeper into the internal corporate network.
Official Vendor Advisories & References
(1) boardData102.php, (2) boardData103.php, (3) boardDataJP.php, (4) boardDataNA.php, and (5) boardDataWW.php in Netgear WN604 before 3.3.3 and WN802Tv2, WNAP210v2, WNAP320, WNDAP350, WNDAP360, and WNDAP660 before 3.5.5.0 allow remote attackers to execute arbitrary commands.
Frequently Asked SecOps Questions (CVE-2016-1555)
FAQQ1. How critical is CVE-2016-1555 and is it actively exploited in the wild?
CVE-2016-1555 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 98.3%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2016-1555?
Primary impacted vendors include netgear across wn604, wn802tv2, wnap210v2, wnap320, wndap350, wndap360, wndap660. Scope summary: Netgear WN604 (firmware before 3.3.3), WN802Tv2, WNAP210v2, WNAP320, WNDAP350, WNDAP360, and WNDAP660 (firmware before 3.5.5.0)
Q3. What temporary mitigations or workarounds exist for CVE-2016-1555 before patching?
[Mitigation] Apply the official firmware updates immediately, or restrict access to the web management interface from untrusted networks Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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