CVE-2025-34037
High PUBLISHEDLinksys Routers E/WAG/WAP/WES/WET/WRT-Series
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Jun 24, 2025
- Exploitation Reported
- Jun 01, 2026
- CVSS
- 10.0 Critical
- EPSS
- 85.4%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| Linksys |
E4200
|
0 to < 1.0.06 |
Affected |
| Linksys |
E3200
|
0 to < 1.0.05 |
Affected |
| Linksys |
E3000
|
0 to < 1.0.06 |
Affected |
| Linksys |
E2500 v1/v2
|
0 to < 2.0.00 |
Affected |
| Linksys |
E2100L v1
|
0 to <= 1.0.05 |
Affected |
| Linksys |
E2000
|
0 |
Affected |
| Linksys |
E1550
|
0 to <= 1.0.03 |
Affected |
| Linksys |
E1500 v1
|
0 to < 1.0.06 |
Affected |
| Linksys |
E1200 v1
|
0 to <= 1.0.04 |
Affected |
| Linksys |
E1000 v1
|
0 to < 2.1.03 |
Affected |
| Linksys |
E900 v1
|
0 to < 1.0.04 |
Affected |
CVE References
- Third-Party Advisory — exploit-db.com exploit-db.com · Third-Party Advisory https://www.exploit-db.com/exploits/31683
- Third-Party Advisory — vulncheck.com vulncheck.com · Third-Party Advisory https://vulncheck.com/advisories/linksys-routers-command-injection
- Technical Description — isc.sans.edu isc.sans.edu · Technical Description https://isc.sans.edu/diary/17633
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| The Shadowserver First | 2026-05-28 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
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
Exploitation Status
Exploited in the wild
Recorded 2026-06-01 10:34:16 UTC · CVE
Weaknesses (CWE)
-
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC about 2 months ago00:00 UTC · about 2 months ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
01:03 UTC about 1 year ago01:03 UTC · about 1 year ago
CVE published
Vulnerability disclosed publicly
-
19:15 UTC over 1 year ago19:15 UTC · over 1 year ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2025-34037
{
"cve_id": "CVE-2025-34037",
"title": "Linksys Routers E/WAG/WAP/WES/WET/WRT-Series",
"affected_vendor": "Linksys",
"affected_product": "E4200, E3200, E3000, E2500 v1/v2, E2100L v1, E2000, E1550, E1500 v1, E1200 v1, E1000 v1, E900 v1",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 10.0,
"epss_score": 0.85373,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}