CVE-2025-34037
An OS command injection flaw in certain Linksys routers allows attackers to run arbitrary shell commands without authentication. The vulnerability is triggered through the /tmUnblock.cgi and /hndUnblock.cgi web endpoints on port 8080. It has been exploited in the wild, notably by the "TheMoon" worm in 2014.
No official fix yet. If none appears within 45 days of first tracking, this entry is removed automatically.
Who is affected
Linksys E‑Series routers accessed via /tmUnblock.cgi and /hndUnblock.cgi on HTTP port 8080, and potentially other Linksys models such as WAG, WAP, WES, WET, WRT series and Wireless‑N access points.
Real-world impact
An attacker can execute any shell command on the router, giving full control over the device, including installing malware, redirecting traffic, or using the router as a launch point for further attacks.
Why this severity
The CVSS score of 10 reflects that the flaw is exploitable without authentication, allows complete compromise of the router, and has a high impact on confidentiality, integrity, and availability.
What to do about it
No official fix or mitigation is documented in the sources yet. Monitor the vendor advisory and apply the patch as soon as it is released.
No fix documented in sources
Timeline
- Jun 24, 2025 · Jun 24, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 22, 2026 · 14d agoAdvisory updatedThe NVD record was last revised.