CVE-2026-71984 Overview
CVE-2026-71984 is a command injection vulnerability [CWE-78] affecting the MSI Radix AXE6600 Wi-Fi 6E tri-band gaming router running firmware version v781521. The flaw resides in the urlfilter function, which fails to sanitize user-supplied input before passing it to an underlying operating system shell. Remote attackers can inject arbitrary shell metacharacters through the vulnerable parameter and execute commands as root on the device. Successful exploitation yields full control of the router, including its network traffic, DNS configuration, and any connected clients.
Critical Impact
Unauthenticated network attackers can obtain root privileges on the underlying operating system, enabling persistent compromise of the router and downstream network traffic interception.
Affected Products
- MSI Radix AXE6600 Wi-Fi 6E Tri-Band Gaming Router
- Firmware version v781521
- urlfilter function within the router web management interface
Discovery Timeline
- 2026-08-09 - CVE-2026-71984 published to NVD
- 2026-08-10 - Last updated in NVD database
Technical Details for CVE-2026-71984
Vulnerability Analysis
The vulnerability is an operating system command injection issue classified under [CWE-78]. The urlfilter function in the router's web administration interface accepts attacker-controlled input and forwards it to a shell without proper neutralization of special characters. Because the router runs the vulnerable service as root, injected commands inherit root privileges on the underlying Linux system.
Attack complexity is low, no privileges are required, and no user interaction is needed. The impact spans confidentiality, integrity, and availability, since a compromised router can be used to sniff traffic, pivot into the internal network, modify DNS responses, or drop the device into a persistent bricked or backdoored state.
EPSS data available at the time of publication estimates a 1.35% probability of exploitation within 30 days.
Root Cause
The root cause is missing input validation and shell metacharacter sanitization in the urlfilter handler. User-supplied data intended to configure URL filtering rules is concatenated directly into a shell command string. Characters such as `, ;, &, |, and $() are not filtered or escaped, allowing arbitrary command substitution.
Attack Vector
The vulnerability is exploitable over the network against the router's management interface. An attacker sends a crafted HTTP request to the endpoint invoking the urlfilter function, embedding shell metacharacters within a URL filter field. When the router processes the request, the injected payload executes as root. See the VulnCheck Advisory for MSI for endpoint and parameter specifics.
No verified proof-of-concept code has been published at the time of writing. The vulnerability mechanism is described in prose only; refer to the vendor and third-party advisories for technical reproduction details.
Detection Methods for CVE-2026-71984
Indicators of Compromise
- Unexpected outbound connections from the router's management IP to attacker-controlled infrastructure
- HTTP POST requests to the router's urlfilter configuration endpoint containing shell metacharacters such as ;, |, `, or $()
- Modified DNS resolver configuration or unexpected iptables rules on the router
- New listening services or reverse shells on non-standard ports on the router
Detection Strategies
- Inspect router administration logs for anomalous requests to URL filter configuration endpoints, especially those containing shell metacharacters or encoded command payloads
- Baseline outbound traffic from network infrastructure devices and alert on deviations, including connections to uncommon destinations or protocols
- Correlate authentication events against the router's admin interface with subsequent configuration changes
Monitoring Recommendations
- Ingest router syslog and administrative access logs into a centralized logging platform for retention and correlation
- Monitor for firmware version v781521 in asset inventories to identify vulnerable devices
- Alert on DNS or DHCP configuration changes originating from the router that were not authorized through change management
How to Mitigate CVE-2026-71984
Immediate Actions Required
- Restrict access to the router's web administration interface to trusted management VLANs and disable remote administration from the WAN
- Change router administrator credentials and rotate any shared Wi-Fi pre-shared keys if compromise is suspected
- Audit the router configuration for unauthorized URL filter rules, DNS changes, or new services
Patch Information
No vendor patch identifier is listed in the enriched data at the time of publication. Consult the MSI Router Support Page for firmware updates newer than v781521 and apply them once available. Additional advisory context is available on the VulnCheck Advisory for MSI.
Workarounds
- Place the router's management interface behind a network access control list that permits only trusted internal hosts
- Disable the URL filter feature if it is not operationally required until a firmware update is available
- Segment the router from sensitive internal networks so that a compromise cannot pivot directly into critical assets
# Example ACL restricting router management access to a trusted subnet
# Apply on the upstream firewall or router itself
allow tcp from 10.10.0.0/24 to <router-mgmt-ip> port 80,443
deny tcp from any to <router-mgmt-ip> port 80,443
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
