CVE-2026-13564 Edimax CVE debrief

Who should care

Network administrators and security teams responsible for Edimax EW-7478APC devices should be aware of this vulnerability. They should assess their current device inventory, check for any signs of compromise, and apply patches or mitigations as necessary. Additionally, security teams should monitor network traffic for potential exploitation attempts.

Technical summary

The vulnerability is caused by a stack-based buffer overflow in the formPPPoESetup POST request handler of Edimax EW-7478APC version 1.04. The overflow occurs when the pppUserName argument is not properly validated, allowing an attacker to inject malicious data. The CVSS score for this vulnerability is 7.4, indicating a high severity level. The vulnerability can be exploited remotely, and its exploit has been made public.

Defensive priority

High priority should be given to patching Edimax EW-7478APC devices. Network administrators should verify that their devices are running a patched firmware version and monitor network traffic for potential exploitation attempts.

Recommended defensive actions

• Apply patches or updates provided by the vendor to fix the stack-based buffer overflow vulnerability.
• Conduct a thorough inventory of Edimax EW-7478APC devices and assess their current firmware versions.
• Monitor network traffic for potential exploitation attempts and signs of compromise.
• Implement compensating controls, such as firewall rules or intrusion detection systems, to detect and prevent exploitation attempts.
• Consider replacing Edimax EW-7478APC devices with alternative products that have a better security track record.

Evidence notes

The CVE-2026-13564 vulnerability was found in Edimax EW-7478APC version 1.04. The vulnerability is caused by a stack-based buffer overflow in the formPPPoESetup POST request handler. The exploit has been made public, and the vendor has not responded to this disclosure. The CVSS score for this vulnerability is 7.4, indicating a high severity level.

Official resources