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
- 2026-05-28
- Advisory published
- 2026-05-25
- Advisory updated
- 2026-05-28
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.
Official resources
Public disclosure occurred on 2026-05-25 with exploit details published. Vendor non-response increases exposure window.