Vulnerability-Lookup

GHSA-4C6F-V7Q4-2M38

Vulnerability from github – Published: 2025-06-26 21:31 – Updated: 2026-07-22 18:31

Details

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.

Severity

10.0 (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

Show details on source website

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CVE-2025-34037 (GCVE-0-2025-34037)

Vulnerability from cvelistv5 – Published: 2025-06-24 01:03 – Updated: 2026-07-22 14:59 X_Known Exploited Vulnerability

Title

Linksys Routers E/WAG/WAP/WES/WET/WRT-Series

Summary

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.

Severity

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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-24 15:53 UTC

CWE

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

Assigner

VulnCheck mitre root

References

4 references

URL	Tags
https://isc.sans.edu/diary/17633	technical-description
https://www.exploit-db.com/exploits/31683	third-party-advisoryexploit
https://vulncheck.com/advisories/linksys-routers-…	third-party-advisory
https://github.com/Jarrettgohxz/CVE-research/tree…

Impacted products

11 products

Vendor	Product	Version
Linksys	E4200	Affected: 0 , < 1.0.06 (custom)
Linksys	E3200	Affected: 0 , < 1.0.05 (custom)
Linksys	E3000	Affected: 0 , < 1.0.06 (custom)
Linksys	E2500 v1/v2	Affected: 0 , < 2.0.00 (custom)
Linksys	E2100L v1	Affected: 0 , ≤ 1.0.05 (custom)
Linksys	E2000	Affected: 0 (semver)
Linksys	E1550	Affected: 0 , ≤ 1.0.03 (custom)
Linksys	E1500 v1	Affected: 0 , < 1.0.06 (custom)
Linksys	E1200 v1	Affected: 0 , ≤ 1.0.04 (custom)
Linksys	E1000 v1	Affected: 0 , < 2.1.03 (custom)
Linksys	E900 v1	Affected: 0 , < 1.0.04 (custom)

Date Public

2014-02-16 00:00

Credits

Johannes Ullrich of SANS Internet Storm Center

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.