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CVE-2026-9424 Edimax CVE debrief

A command injection vulnerability exists in the Edimax EW-7438RPn wireless range extender firmware version 1.31. The vulnerability resides in the formWlanMP function within the /goform/formWlanMP endpoint, where multiple parameters—including ateFunc, ateGain, ateTxCount, ateChan, ateRate, ateMacID, e2pTxPower1 through e2pTxPower7, e2pTx2Power1 through e2pTx2Power7, ateTxFreqOffset, ateMode, ateBW, ateAntenna, e2pTxFreqOffset, e2pTxPwDeltaB, e2pTxPwDeltaG, e2pTxPwDeltaMix, e2pTxPwDeltaN, and readE2P—are insufficiently sanitized before being passed to system shell commands. An authenticated attacker with network access can inject arbitrary operating system commands through these parameters. The vulnerability has been publicly disclosed with proof-of-concept material available, and the vendor was notified but did not respond. The CVSS 4.0 vector indicates network attack vector with low attack complexity, no privileges required, and low impacts across confidentiality, integrity, and availability dimensions.

Vendor
Edimax
Product
EW-7438RPn
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-25
Original CVE updated
2026-07-23
Advisory published
2026-05-25
Advisory updated
2026-07-23

Who should care

Organizations deploying Edimax EW-7438RPn range extenders in production environments, particularly those with exposed management interfaces or in regulated industries requiring command execution controls. Security teams responsible for IoT and network infrastructure asset management should prioritize inventory and risk assessment.

Technical summary

The Edimax EW-7438RPn firmware 1.31 contains a command injection vulnerability in its wireless configuration handler. The formWlanMP function processes numerous ATE (Advanced Test Equipment) and EEPROM-related parameters without adequate sanitization, allowing authenticated remote attackers to execute arbitrary shell commands. The attack surface is exposed through the device's web management interface. Multiple parameters related to transmit power calibration, frequency offset, and EEPROM operations are affected. The vulnerability is exploitable remotely and proof-of-concept code has been published.

Defensive priority

medium

Recommended defensive actions

  • Restrict network access to administrative interfaces of Edimax EW-7438RPn devices
  • Implement network segmentation to isolate affected range extenders from critical infrastructure
  • Monitor for suspicious requests to /goform/formWlanMP containing shell metacharacters
  • Consider discontinuing use of firmware version 1.31 pending vendor patch availability
  • Review logs for unauthorized configuration changes or unexpected system behavior
  • Apply input validation and parameterized command execution if custom firmware modifications are deployed

Evidence notes

Vulnerability confirmed through Vuldb entry and associated GitHub repository containing technical details. CWE-77 and CWE-78 classified. CVSS 4.0 scoring applied.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9424 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9424

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-9424 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9424

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.