Linksys Routers E/WAG/WAP/WES/WET/WRT-Series
Summary
| CVE | CVE-2025-34037 |
|---|---|
| State | PUBLISHED |
| Assigner | VulnCheck |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2025-06-24 01:15:25 UTC |
| Updated | 2026-07-22 16:17:05 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 10 CRITICAL from [email protected]
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/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: 0.860600000 probability, percentile 0.997110000 (date 2026-07-22)
Problem Types: CWE-78 | CWE-78 CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 10 | CRITICAL | 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/E:X/C... |
| 4.0 | CNA | CVSS | 10 | CRITICAL | 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 |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowAttack Requirements
NonePrivileges Required
NoneUser Interaction
NoneConfidentiality
HighIntegrity
HighAvailability
HighSub Conf.
HighSub Integrity
HighSub Availability
HighCVSS: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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linksys | E4200 | affected 1.0.06 custom | Not specified |
| CNA | Linksys | E3200 | affected 1.0.05 custom | Not specified |
| CNA | Linksys | E3000 | affected 1.0.06 custom | Not specified |
| CNA | Linksys | E2500 V1/v2 | affected 2.0.00 custom | Not specified |
| CNA | Linksys | E2100L V1 | affected 1.0.05 custom | Not specified |
| CNA | Linksys | E2000 | affected semver | Not specified |
| CNA | Linksys | E1550 | affected 1.0.03 custom | Not specified |
| CNA | Linksys | E1500 V1 | affected 1.0.06 custom | Not specified |
| CNA | Linksys | E1200 V1 | affected 1.0.04 custom | Not specified |
| CNA | Linksys | E1000 V1 | affected 2.1.03 custom | Not specified |
| CNA | Linksys | E900 V1 | affected 1.0.04 custom | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| isc.sans.edu/diary/17633 | [email protected] | isc.sans.edu | |
| github.com/Jarrettgohxz/CVE-research/tree/main/Linksys/E-series/CVE-2025... | af854a3a-2127-422b-91ae-364da2661108 | github.com | |
| vulncheck.com/advisories/linksys-routers-command-injection | [email protected] | vulncheck.com | |
| www.exploit-db.com/exploits/31683 | [email protected] | www.exploit-db.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Johannes Ullrich of SANS Internet Storm Center (en)
There are currently no legacy QID mappings associated with this CVE.