CVE-2026-109110 Overview
CVE-2026-109110 is an operating system command injection vulnerability affecting the Wavlink WL-WN592AX6 wireless device, firmware version 250422. The flaw resides in the system function of the wmapd daemon component. Attackers can exploit the issue remotely over the network without authentication or user interaction. A public exploit has been released, increasing the likelihood of opportunistic attacks against exposed devices. The weakness is categorized under CWE-77: Improper Neutralization of Special Elements used in a Command.
Critical Impact
Unauthenticated remote attackers can inject arbitrary operating system commands into the wmapd daemon, leading to full device compromise and persistent control over affected Wavlink hardware.
Affected Products
- Wavlink WL-WN592AX6 firmware version 250422
- Component: wmapd daemon, system function
- Deployment: Wavlink wireless networking devices exposed on the network
Discovery Timeline
- 2026-10-13 - CVE-2026-109110 published to the National Vulnerability Database
- 2026-10-15 - Entry last modified in NVD
Technical Details for CVE-2026-109110
Vulnerability Analysis
The vulnerability affects the wmapd daemon shipped with the Wavlink WL-WN592AX6 device. The system function processes attacker-controllable input without proper neutralization of shell metacharacters. When a crafted request reaches the daemon, embedded command separators are passed to the underlying operating system shell. This allows arbitrary commands to run with the privileges of the daemon process, which typically runs as root on embedded Linux routers. Because the attack path is reachable remotely and requires no credentials, exposure extends to any network segment that can route traffic to the device management interface.
Root Cause
The root cause is improper neutralization of special elements in a command string ([CWE-77]). The wmapd daemon concatenates user-supplied data into a shell command invoked through the system() C library call. Metacharacters such as ;, |, &, and backticks are not filtered or escaped. The resulting command string is executed by /bin/sh, which interprets the injected tokens as additional commands.
Attack Vector
The attack vector is network-based and unauthenticated. An attacker sends a crafted request to the service handled by the wmapd daemon with a malicious payload embedded in a parameter processed by the vulnerable system call. Successful exploitation yields arbitrary command execution on the device. Attackers can use this foothold to modify firmware configuration, install persistent implants, pivot to internal network segments, or recruit the device into a botnet. A public proof-of-concept has been referenced in the VulDB entry for CVE-2026-109110.
Detailed technical references are available in the VulDB vulnerability record #416861 and the associated cyber threat intelligence profile.
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Stop Exploit AttemptsDetection Methods for CVE-2026-109110
Indicators of Compromise
- Unexpected child processes spawned by the wmapd daemon, especially /bin/sh, wget, curl, tftp, or nc
- Outbound connections from the device to unknown IP addresses or known malware distribution hosts
- Modified startup scripts, rc.local, or new cron entries on the device filesystem
- HTTP or management-interface requests containing shell metacharacters such as ;, |, &&, or backticks in parameters consumed by wmapd
Detection Strategies
- Inspect network traffic to the Wavlink device management interface for request parameters containing command separators or encoded shell payloads
- Correlate device logs with firewall telemetry to identify anomalous outbound connections initiated by the device after inbound administrative traffic
- Baseline normal wmapd process behavior and alert on deviations, including unexpected process ancestry
Monitoring Recommendations
- Capture and retain syslog output from the device in a central log store for retrospective analysis
- Monitor for scanning activity targeting ports used by the Wavlink web management interface across the internal network
- Track EPSS scoring and vendor advisories for updated exploitation telemetry; the current EPSS percentile for this CVE sits in the upper range of actively tracked vulnerabilities
How to Mitigate CVE-2026-109110
Immediate Actions Required
- Remove direct internet exposure of the WL-WN592AX6 management interface and restrict access to trusted administrative networks
- Change all default credentials on affected devices and audit for unauthorized configuration changes
- Isolate affected devices on a dedicated VLAN until a vendor patch is applied
- Review device logs and network flows for signs of prior exploitation given the availability of a public exploit
Patch Information
At the time of publication, no vendor patch has been referenced in the NVD entry for CVE-2026-109110. Administrators should monitor the Wavlink support site for firmware updates addressing the wmapd daemon and apply them as soon as they are released. The vendor was contacted prior to disclosure according to the published advisory.
Workarounds
- Block inbound traffic to the device management service at the perimeter firewall and internal segmentation boundaries
- Disable remote management features on the WL-WN592AX6 if the device supports toggling them
- Replace affected devices with alternative hardware in high-sensitivity environments until a patched firmware is available
# Example: restrict access to the Wavlink management interface using iptables
# Replace 10.0.0.0/24 with your trusted admin subnet and <device_ip> with the device address
iptables -A FORWARD -s 10.0.0.0/24 -d <device_ip> -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d <device_ip> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <device_ip> -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
