Vulnerability details
CVE-2025-34037
Linksys Routers E/WAG/WAP/WES/WET/WRT-Series
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 10.0Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linksys | E1000 v1 | v < 2.1.03 | CVEProject cvelistV5 (CNA) |
| Linksys | E1200 v1 | v ≤ 1.0.04 | CVEProject cvelistV5 (CNA) |
| Linksys | E1500 v1 | v < 1.0.06 | CVEProject cvelistV5 (CNA) |
| Linksys | E1550 | v ≤ 1.0.03 | CVEProject cvelistV5 (CNA) |
| Linksys | E2000 | All | CVEProject cvelistV5 (CNA) |
| Linksys | E2100L v1 | v ≤ 1.0.05 | CVEProject cvelistV5 (CNA) |
| Linksys | E2500 v1/v2 | v < 2.0.00 | CVEProject cvelistV5 (CNA) |
| Linksys | E3000 | v < 1.0.06 | CVEProject cvelistV5 (CNA) |
| Linksys | E3200 | v < 1.0.05 | CVEProject cvelistV5 (CNA) |
| Linksys | E4200 | v < 1.0.06 | CVEProject cvelistV5 (CNA) |
| Linksys | E900 v1 | v < 1.0.04 | CVEProject cvelistV5 (CNA) |
References and advisories
4- https://isc.sans.edu/diary/17633 technical-description
- https://www.exploit-db.com/exploits/31683 third-party-advisoryexploit
- https://vulncheck.com/advisories/linksys-routers-command-injection third-party-advisory
- https://github.com/Jarrettgohxz/CVE-research/tree/main/Linksys/E-series/CVE-2025-34037
Details
- Published
- 2025-06-24
- Last updated
- 2026-07-22
- State
- Published
- Assigner (CNA)
- VulnCheck
- Kolun priority
- 50 · Medium
Exploit prediction (EPSS)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Total
Weaknesses (CWE)
- CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')