CVE-2025-34037

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 is exploited in the wild by the "TheMoon" worm to deploy a MIPS ELF payload, enabling arbitrary code execution on the router. 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.

CVSS v4.0

10.0 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

90.88% chance of exploitation in the next 30 days, 100th percentile

Published

2025-06-24

Updated

2026-07-22

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/31683
• Taxanehh/CVE-2025-34037

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/linksys_themoon_exec.…

References

• CVE Record
• NVD entry

Related

• CVE-2025-34036
• CVE-2025-34038
• CVE-2025-34035
• CVE-2025-34039
• CVE-2025-34034
• CVE-2025-34040