CVE-2026-7692: Wavlink WL-WN570HA1 Firmware RCE Flaw

CVE-2026-7692 Overview

CVE-2026-7692 is a command injection vulnerability in the Wavlink WL-WN570HA1 wireless access point running firmware version R70HA1 V1410_221110. The flaw resides in the ping_ddns function within /cgi-bin/adm.cgi, where the DDNS argument is passed to a shell context without proper sanitization. An authenticated remote attacker can manipulate the DDNS parameter to execute arbitrary operating system commands on the device. The vendor confirmed that the affected firmware has been removed from the Wavlink website, and the product is no longer supported. Public exploit details have been disclosed, increasing the likelihood of opportunistic abuse against exposed devices [CWE-74].

Critical Impact

Remote authenticated attackers can inject arbitrary shell commands through the DDNS parameter of /cgi-bin/adm.cgi, gaining command execution on end-of-life Wavlink WL-WN570HA1 devices that will not receive a patch.

Affected Products

• Wavlink WL-WN570HA1 hardware (all units running the affected firmware)
• Wavlink WL-WN570HA1 firmware version R70HA1 V1410_221110
• End-of-life devices not eligible for vendor patches

Discovery Timeline

• 2026-05-03 - CVE-2026-7692 published to NVD
• 2026-05-07 - Last updated in NVD database

Technical Details for CVE-2026-7692

Vulnerability Analysis

The vulnerability exists in the ping_ddns function exposed through the administrative CGI endpoint /cgi-bin/adm.cgi. The function accepts a user-supplied DDNS argument intended to specify a Dynamic DNS hostname for connectivity testing. Instead of validating the input as a hostname, the firmware passes the value into a shell command execution path. Attackers can append shell metacharacters such as ;, |, or backticks to the DDNS parameter, causing the device to execute attacker-supplied commands with the privileges of the web server process, typically root on embedded routers. The exploit requires network reachability to the management interface and low-privilege credentials, but post-exploitation access enables full device takeover, traffic interception, and lateral movement into the connected network.

Root Cause

The root cause is improper neutralization of special elements in input used by a downstream component [CWE-74]. The ping_ddns handler concatenates the DDNS argument directly into a system shell invocation rather than using a parameterized API or strict allow-list validation for hostname characters.

Attack Vector

The attack vector is network-based against the device's HTTP administration interface. An attacker submits a crafted POST or GET request to /cgi-bin/adm.cgi invoking ping_ddns with a malicious DDNS value. Because the device is end-of-life and the proof-of-concept has been published on third-party research portals, exploitation tooling is available to opportunistic attackers scanning for exposed Wavlink devices.

No verified exploit code is reproduced here. Refer to the Notion Article on Wavlink and VulDB Vulnerability #360862 for technical write-ups.

Detection Methods for CVE-2026-7692

Indicators of Compromise

• HTTP requests to /cgi-bin/adm.cgi containing the ping_ddns action with shell metacharacters such as ;, &&, |, or backticks in the DDNS parameter.
• Outbound connections from the WL-WN570HA1 device to unfamiliar IPs, particularly to download stagers or contact command-and-control infrastructure.
• Unexpected processes spawned by the device's httpd or CGI handler, visible in any forwarded syslog stream.

Detection Strategies

• Inspect web server and reverse proxy logs in front of Wavlink devices for adm.cgi requests carrying non-hostname characters in the DDNS field.
• Deploy network IDS signatures that flag URI patterns combining adm.cgi, ping_ddns, and shell metacharacters.
• Correlate authentication events on the management interface with subsequent anomalous outbound traffic from the access point.

Monitoring Recommendations

• Forward syslog from network infrastructure to a centralized logging platform and alert on CGI request anomalies targeting Wavlink endpoints.
• Baseline outbound traffic from access points and alert on deviations such as connections to non-DDNS providers from the device IP.
• Monitor administrative authentication attempts against the device for credential stuffing and brute-force precursors to exploitation.

How to Mitigate CVE-2026-7692

Immediate Actions Required

• Decommission and replace the Wavlink WL-WN570HA1 because the product line no longer receives security updates from the vendor.
• Remove the device's management interface from any internet-facing network segment until replacement is complete.
• Rotate all administrative credentials used on the device and on adjacent network equipment that shared those credentials.

Patch Information

No patch is available. The vendor confirmed that firmware R70HA1 V1410_221110 has been removed from the Wavlink website, and the affected product is no longer supported. Replacement with a currently supported wireless access point is the only fully effective remediation. See VulDB Vulnerability #360862 for vendor confirmation details.

Workarounds

• Place the device behind a network firewall that restricts management access to a dedicated administrative VLAN and trusted source IPs.
• Disable remote administration features and the WAN-side web interface where the firmware permits.
• Segment the WL-WN570HA1 onto an isolated network so that successful exploitation cannot pivot into production assets.

# Example firewall restriction limiting access to /cgi-bin/adm.cgi
# Allow only the admin workstation to reach the device management UI
iptables -A FORWARD -s 10.10.10.5 -d 192.168.10.1 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 192.168.10.1 -p tcp --dport 80 -j DROP
iptables -A FORWARD -d 192.168.10.1 -p tcp --dport 443 -j DROP