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PatchSiren cyber security CVE debrief

CVE-2026-9482 Edimax CVE debrief

A stack-based buffer overflow vulnerability exists in the Edimax EW-7438RPn wireless range extender firmware version 1.31. The vulnerability is located in the `formSDHCP` function within the `/goform/formSDHCP` endpoint, where improper handling of the `submit-url` argument allows remote attackers to trigger memory corruption. The CVSS 4.0 score of 7.4 (HIGH) reflects network attack vector, low attack complexity, and high impacts to confidentiality, integrity, and availability. The exploit has been publicly disclosed, and the vendor was reportedly contacted without response. No patch is currently available.

Vendor
Edimax
Product
EW-7438RPn
CVSS
HIGH 7.4
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

Network administrators managing Edimax wireless infrastructure, security teams responsible for IoT device security, and organizations with EW-7438RPn deployments in production environments

Technical summary

The vulnerability resides in the `formSDHCP` function processing the `submit-url` parameter in the `/goform/formSDHCP` CGI endpoint. Insufficient bounds checking enables stack-based buffer overflow through crafted remote requests. Attack complexity is low with no user interaction required. Successful exploitation yields high impact across confidentiality, integrity, and availability dimensions. The attack surface is exposed on the device's web management interface.

Defensive priority

high

Recommended defensive actions

  • Block or restrict access to /goform/formSDHCP endpoint on affected Edimax EW-7438RPn devices
  • Segment IoT device networks to limit lateral movement from compromised range extenders
  • Monitor for anomalous requests to goform endpoints with oversized submit-url parameters
  • Apply firmware updates from Edimax when available; consider device replacement if patching is not forthcoming
  • Review network logs for indicators of compromise targeting Edimax management interfaces

Evidence notes

Vulnerability identified through Vuldb CNA submission. Technical details and proof-of-concept disclosed via GitHub repository. NVD record status is 'Deferred'. Vendor attribution derived from reference domain analysis with low confidence; product identification requires verification.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-9482 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-9482

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

  • CVE-2026-9482 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-9482

    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.