Atomicorp WAF Research Note: CVE-2026-19586

Pre-Authentication OS Command Injection in Omada Gateways on OpenVPN Server in Omada Gateways

CVE Details

• Already protected by existing Atomicorp WAF rules
• Protection status: Understanding Atomicorp WAF Protection Status
• CVE: CVE-2026-19586
• Name: Pre-Authentication OS Command Injection in Omada Gateways on OpenVPN Server in Omada Gateways
• Severity: Critical
• CVSS: 9.3 (v4.0) (Critical)
• CVSS version: 4.0
• CVSS source: TPLink CNA
• CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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
  • Attack vector: Network
  • Attack complexity: Low
  • Attack requirements: None
  • Privileges required: None
  • User interaction: None
  • Vulnerable-system confidentiality: High
  • Vulnerable-system integrity: High
  • Vulnerable-system availability: High
  • Subsequent-system confidentiality: Low
  • Subsequent-system integrity: Low
  • Subsequent-system availability: Low
  • Scope: X
• CWE: CWE-78 — Improper Neutralization of Special Elements used in an OS Command (‘OS Command Injection’)
• Related CAPEC attack patterns (via MITRE CWE relationships): CAPEC-108 (opens in a new tab) , CAPEC-15 (opens in a new tab) , CAPEC-43 (opens in a new tab) , CAPEC-6 (opens in a new tab) , CAPEC-88 (opens in a new tab)
• Vendor: tp-link
• Vulnerable products: er7212pc firmware , er605 firmware , er605w firmware , er7206 firmware , er7406 firmware , er707-m2 firmware , er7412-m2 firmware , er8411 firmware , er706w firmware , er706w-4g firmware , er706wp-4g firmware , er703wp-4g-outdoor firmware , er603wp-4g-outdoor firmware , er701-5g-outdoor firmware , dr3220v-4g firmware , dr3650v firmware , dr3650v-4g firmware , dr3150 firmware
• CVE published: 2026-08-20
• CVE last modified: 2026-09-03
• Affected versions (NVD configurations):
  • er7212pc firmware: < 2.4.3
  • er605 firmware: < 2.4.4
  • er605w firmware: < 2.0.4
  • er7206 firmware: < 2.3.5
  • er7406 firmware: < 1.3.4
  • er707-m2 firmware: < 1.4.4
  • er7412-m2 firmware: < 1.2.0
  • er8411 firmware: < 1.4.1
  • er706w firmware: < 1.2.11
  • er706w-4g firmware: < 1.2.6
  • er706w-4g firmware: < 2.1.11
  • er706wp-4g firmware: < 1.1.11
  • er703wp-4g-outdoor firmware: < 1.1.7
  • er603wp-4g-outdoor firmware: < 1.0.2
  • er701-5g-outdoor firmware: < 1.0.3
  • dr3220v-4g firmware: < 1.2.0
  • dr3650v firmware: < 1.2.0
  • dr3650v-4g firmware: < 1.2.0
  • dr3150 firmware: < 1.0.1
• EPSS: 0.0570; 92.6th percentile (FIRST (opens in a new tab) )
• Latest Update: 2026-09-06
• Selected Rule IDs observed: 340014 , 340023 , 340029 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 393655
• Matching rules: 10; rules with blocking actions: 10
• Would-block Rule IDs: 340014 , 340023 , 340029 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 393655
• Request surfaces inspected: JSON request data, Request URI, Request argument names, Request arguments, Request cookies, SOAP request data, XML request data

Vulnerability Description

A pre-authentication OS command injection vulnerability has been identified in Omada gateways configured to operate as an OpenVPN Server due to insufficient validation of client-supplied data during OpenVPN connection establishment. An unauthenticated remote attacker may provide specially crafted input influencing backend command execution logic before authentication completes. Exploitation requires the OpenVPN Server feature to be enabled, VPN service reachable by the attacker and attacker to be able to initiate an OpenVPN connection attempt. 

Successful exploitation may allow arbitrary command execution, potentially leading to full compromise of the affected device.

Recommended Actions

1. Maintain the observed Atomicorp protections. Keep your Atomicorp commercial rules current and confirm that the selected observed rules (340014 , 340023 , 340029 , 344360 , 344361 , 344363 , 344364 , 344366 , 344370 , 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: TP-Link Systems Inc. ER7212PC v2 versions earlier than 2.4.3 Build 20260722 Rel.40250.
   • Affected versions: TP-Link Systems Inc. ER605 v2 versions earlier than 2.4.4 Build 20260630 Rel.14398.
   • Affected versions: TP-Link Systems Inc. ER7206 v2 versions earlier than 2.3.5 Build 20260625 Rel.43136.
   • Affected versions: TP-Link Systems Inc ER7406 v1 versions earlier than 1.3.4 Build 20260625 Rel.43136.
   • Affected versions: TP-Link Systems Inc. ER707-M2 v1 versions earlier than 1.4.4 Build 20260625 Rel.43063.
   • Affected versions: TP-Link Systems Inc ER7412-M2 v1 versions earlier than 1.2.0 Build 20260630 Rel.82947.
   • Affected versions: TP-Link Systems Inc. ER8411 v1 versions earlier than 1.4.1 Build 20260708 Rel.64832.
   • Affected versions: TP-Link Systems Inc. ER706W v1 versions earlier than 1.2.11 Build 20260723 Rel.41567.
   • Affected versions: TP-Link Systems Inc. v1 versions earlier than 1.2.6 Build 20260723 Rel.41321.
   • Affected versions: TP-Link Systems Inc. ER706W-4G v2 versions earlier than 2.1.11 Build 20260723 Rel.41624.
   • Affected versions: TP-Link Systems Inc. ER706WP-4G v1 versions earlier than 1.1.11 Build 20260723 Rel.41624.
   • Affected versions: TP-Link Systems Inc. ER703WP-4G-Outdoor v1 versions earlier than 1.1.7 Build 20260723 Rel.41712.
   • Affected versions: TP-Link Systems Inc. DR3220v-4G v1 versions earlier than 1.2.0 Build 20260630 Rel.82652.
   • Affected versions: TP-Link Systems Inc. DR3650v v1 versions earlier than 1.2.0 Build 20260630 Rel.83311.
   • Affected versions: TP-Link Systems Inc. DR3650v-4G v1 versions earlier than 1.2.0 Build 20260630 Rel.83347.
   • Affected versions: TP-Link Systems Inc. ER603WP-4G-Outdoor v1 versions earlier than 1.0.2 Build 20260723 Rel.43271.
   • Affected versions: TP-Link Systems Inc. DR3150 v1 versions earlier than 1.0.1 Build 20260722 Rel.16854.
   • Affected versions: TP-Link Systems Inc. ER701-5G-Outdoor v1 versions earlier than 1.0.3 Build 20260723 Rel.40931.
   • Affected versions: TP-Link Systems Inc. ER605W v2 versions earlier than 2.0.4 Build 20260723 Rel.43763.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER7212PC v2 to 2.4.3 Build 20260722 Rel.40250 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER605 v2 to 2.4.4 Build 20260630 Rel.14398 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER7206 v2 to 2.3.5 Build 20260625 Rel.43136 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc ER7406 v1 to 1.3.4 Build 20260625 Rel.43136 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER707-M2 v1 to 1.4.4 Build 20260625 Rel.43063 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc ER7412-M2 v1 to 1.2.0 Build 20260630 Rel.82947 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER8411 v1 to 1.4.1 Build 20260708 Rel.64832 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER706W v1 to 1.2.11 Build 20260723 Rel.41567 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. v1 to 1.2.6 Build 20260723 Rel.41321 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER706W-4G v2 to 2.1.11 Build 20260723 Rel.41624 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER706WP-4G v1 to 1.1.11 Build 20260723 Rel.41624 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER703WP-4G-Outdoor v1 to 1.1.7 Build 20260723 Rel.41712 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. DR3220v-4G v1 to 1.2.0 Build 20260630 Rel.82652 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. DR3650v v1 to 1.2.0 Build 20260630 Rel.83311 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. DR3650v-4G v1 to 1.2.0 Build 20260630 Rel.83347 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER603WP-4G-Outdoor v1 to 1.0.2 Build 20260723 Rel.43271 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. DR3150 v1 to 1.0.1 Build 20260722 Rel.16854 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER701-5G-Outdoor v1 to 1.0.3 Build 20260723 Rel.40931 or later.
   • Recommended upgrade: Upgrade TP-Link Systems Inc. ER605W v2 to 2.0.4 Build 20260723 Rel.43763 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

• NVD (opens in a new tab)
• CVE Record (opens in a new tab)
• Exploit or technical research: https://mattg.systems/posts/cve-2026-19586/ (opens in a new tab)
• CVE authority reference: https://www.omadanetworks.com/en/support/download/ (opens in a new tab)
• CVE authority reference: https://www.omadanetworks.com/us/support/download/ (opens in a new tab)
• Vendor advisory: https://www.tp-link.com/us/support/faq/5256/ (opens in a new tab)

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/ (opens in a new tab) .