CVE-2025-34037

Description

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.

PUBLISHED Reserved 2025-04-15 | Published 2025-06-24 | Updated 2026-05-14 | Assigner VulnCheck

Problem types

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Product status

Credits

Johannes Ullrich of SANS Internet Storm Center finder

References

isc.sans.edu/diary/17633 technical-description

www.exploit-db.com/exploits/31683 third-party-advisory exploit

vulncheck.com/advisories/linksys-routers-command-injection third-party-advisory

cve.org (CVE-2025-34037)

nvd.nist.gov (CVE-2025-34037)

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