CVE-2025-34037: Linksys e1000 v1

Critical severity, CVSS 10.0. EPSS: 92.8% chance of exploitation in the next 30 days.

An OS command injection vulnerability exists in various models of E-Series Linksys routers via the /tmUnblock.cgi and /hndUnblock.cgi endpoints over HTTP on port 8080. The CGI scripts improperly process user-supplied input passed to the ttcp_ip parameter without sanitization, allowing unauthenticated attackers to inject shell commands. This vulnerability was reported to be exploited in the wild by the "TheMoon" worm  in 2014 to deploy a MIPS ELF payload, enabling arbitrary code execution on the router. Additionally, this vulnerability may affect other Linksys products to include, but not limited to, WAG/WAP/WES/WET/WRT-series router models and Wireless-N access points and routers. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.

Affected products

• Linksys e1000 v1: before 2.1.03 (fixed in 2.1.03)
• Linksys e1200 v1: up to and including 1.0.04
• Linksys e1500 v1: before 1.0.06 (fixed in 1.0.06)
• Linksys e1550: up to and including 1.0.03
• Linksys e2000: version 0 only
• Linksys e2100l v1: up to and including 1.0.05
• Linksys e2500 v1/v2: before 2.0.00 (fixed in 2.0.00)
• Linksys e3000: before 1.0.06 (fixed in 1.0.06)
• Linksys e3200: before 1.0.05 (fixed in 1.0.05)
• Linksys e4200: before 1.0.06 (fixed in 1.0.06)
• Linksys e900 v1: before 1.0.04 (fixed in 1.0.04)

Published 2025-06-24. Last modified 2026-07-22.