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Atomicorp WAF Research Note: CVE-2025-34037

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

CVE Details

Status: Attack Blocked by Atomicorp

Vulnerability 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.

  1. Maintain the observed Atomicorp protections. Keep your Atomicorp commercial rules current and confirm that the selected observed rules (312658 , 340014 , 340023 , 340029 , 340193 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 347009 , 393655 ) have not been locally disabled. Atomicorp commercial rules are enabled by default. If you use Atomic WAF, review the applicable policy and rule settings.

  2. Apply the vendor’s remediation. WAF protection is defense in depth and does not replace upgrading or following the affected vendor’s guidance.

    • Affected versions: Linksys E4200 versions earlier than 1.0.06.
    • Affected versions: Linksys E3200 versions earlier than 1.0.05.
    • Affected versions: Linksys E3000 versions earlier than 1.0.06.
    • Affected versions: Linksys E2500 v1/v2 versions earlier than 2.0.00.
    • Affected versions: Linksys E2100L v1 versions through 1.0.05.
    • Affected versions: Linksys E1550 versions through 1.0.03.
    • Affected versions: Linksys E1500 v1 versions earlier than 1.0.06.
    • Affected versions: Linksys E1200 v1 versions through 1.0.04.
    • Affected versions: Linksys E1000 v1 versions earlier than 2.1.03.
    • Affected versions: Linksys E900 v1 versions earlier than 1.0.04.
    • Recommended upgrade: Upgrade Linksys E4200 to 1.0.06 or later.
    • Recommended upgrade: Upgrade Linksys E3200 to 1.0.05 or later.
    • Recommended upgrade: Upgrade Linksys E3000 to 1.0.06 or later.
    • Recommended upgrade: Upgrade Linksys E2500 v1/v2 to 2.0.00 or later.
    • Recommended upgrade: Upgrade Linksys E1500 v1 to 1.0.06 or later.
    • Recommended upgrade: Upgrade Linksys E1000 v1 to 2.1.03 or later.
    • Recommended upgrade: Upgrade Linksys E900 v1 to 1.0.04 or later.

  3. Validate after changes. Confirm rule updates are current, review WAF events for the affected application, and test application behavior after vendor upgrades, mitigations, or local policy changes.

Research Notes

Atomicorp WAF protections are designed around attack techniques and exploit behaviors, allowing existing protections to apply across multiple vulnerabilities without requiring a unique rule for every CVE.

Public Vulnerability References

Test or Research Source

  • Source: Atomicorp AI Research Framework
  • Tags: cve, derived, rce, waf-probe

Research Note Context

This research note documents exploit-technique analysis associated with this vulnerability and references Atomicorp WAF protections observed during engineering review, testing, or validation activities.

Atomicorp security controls are generally designed to identify and mitigate attack techniques and exploit behaviors rather than individual CVE identifiers. As a result, protections developed for one vulnerability may also apply to related attack variants and future vulnerabilities using similar techniques.

Learn More

Atomicorp develops commercially supported security technologies for web applications, servers, endpoints, workloads, and legacy enterprise platforms.

Organizations interested in protecting systems against exploit techniques associated with vulnerabilities such as this one can learn more about:

  • Atomic ModSecurity Rules: commercially maintained WAF rules for ModSecurity deployments, including protections for web attacks, bots, scanners, malware, exploitation attempts, and emerging vulnerability classes.
  • Atomic WAF: an enterprise web application firewall with Atomicorp rules, centralized management, reporting, authentication controls, and operational tooling.
  • Atomic ModSecurity Integrator: a special licensing option for MSPs, MSSPs, OEMs, VARs, reverse proxy providers, and other integrators who want to incorporate Atomicorp ModSecurity rule technology into their own products or services.
  • Atomic OSSEC: an enterprise OSSEC-based intrusion detection, compliance, and security monitoring platform.
  • Atomic Protector: workload protection for Linux, web, cloud, data center, and hybrid environments.

For additional information, product evaluations, or technical discussions, visit https://www.atomicorp.com/ or https://modsecurity.io/ .