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Atomicorp WAF Research Note: CVE-2026-19983

GL.iNet XE3000 NAS Command Service gl_nas_sys os command injection

CVE Details

Status: Attack Blocked by Atomicorp

Vulnerability Description

A vulnerability was detected in GL.iNet A1300, AX1800, AXT1800, MT2500, MT3000, MT6000, X3000 and XE3000 4.8.x. This issue affects some unknown processing of the file /usr/bin/gl_nas_sys of the component NAS Command Service. The manipulation results in os command injection. The attack may be launched remotely. Upgrading to version 4.9.0 is capable of addressing this issue. It is suggested to upgrade the affected component. The vendor explains: “After our investigation, we have confirmed that the vulnerability described (…) does indeed exist.”

  1. Maintain the observed Atomicorp protections. Keep your Atomicorp commercial rules current and confirm that the selected observed rules (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: GL.iNet A1300 version 4.8.*.
    • Versions reported unaffected: GL.iNet A1300 version 4.9.0.
    • Affected versions: GL.iNet AX1800 version 4.8.*.
    • Versions reported unaffected: GL.iNet AX1800 version 4.9.0.
    • Affected versions: GL.iNet AXT1800 version 4.8.*.
    • Versions reported unaffected: GL.iNet AXT1800 version 4.9.0.
    • Affected versions: GL.iNet MT2500 version 4.8.*.
    • Versions reported unaffected: GL.iNet MT2500 version 4.9.0.
    • Affected versions: GL.iNet MT3000 version 4.8.*.
    • Versions reported unaffected: GL.iNet MT3000 version 4.9.0.
    • Affected versions: GL.iNet MT6000 version 4.8.*.
    • Versions reported unaffected: GL.iNet MT6000 version 4.9.0.
    • Affected versions: GL.iNet X3000 version 4.8.*.
    • Versions reported unaffected: GL.iNet X3000 version 4.9.0.
    • Affected versions: GL.iNet XE3000 version 4.8.*.
    • Versions reported unaffected: GL.iNet XE3000 version 4.9.0.
    • No specific CNA/vendor solution or workaround is included in the current CVE Record . Review the vendor’s security advisories and supported-release guidance before making changes.

  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/ .