# CVE-2026-13580: Edimax EW-7478APC buffer overflow in formQoS POST handler

Source: https://junglewise.ai/threats/cve-2026-13580-edimax-ew-7478apc-buffer-overflow-in-formqos-post-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-29. Updated: 2026-06-29  
License: CC BY 4.0 with a link back

CVE-2026-13580 · Severity: high · CVSS 8.8 · Published 2026-06-29

A security flaw has been identified in the Edimax EW-7478APC wireless router, a device used to provide internet connectivity and manage network traffic. An attacker can exploit this vulnerability to take control of the device or cause it to crash by sending a specially crafted web request. This could lead to a complete loss of internet service, unauthorized access to the local network, or the interception of data passing through the router.

Technologies: [Edimax EW-7478APC](https://junglewise.ai/threats/technologies/ew-7478apc). Vendors: [Edimax](https://junglewise.ai/threats/vendors/edimax).

## Quick answers

**Is CVE-2026-13580 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13580 being exploited in the wild.

**How severe is CVE-2026-13580?** High severity, with a CVSS score of 8.8, published 29 June 2026.

**Which products and versions are affected?** Edimax EW-7478APC 1.04.

**Is there a fix for CVE-2026-13580?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-13580 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-13580?** Check whether you run Edimax EW-7478APC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow vulnerability exists in the Edimax EW-7478APC firmware version 1.04. The flaw is located in the 'formQoS' function within the '/goform/formQoS' endpoint, which serves as a POST request handler. The vulnerability is triggered by insufficient validation of the 'selSSID' argument, allowing an attacker to overwrite memory on the stack. This is a remote, unauthenticated attack vector that can lead to arbitrary code execution or a device crash. While the vendor was notified, no patch has been released, and exploit details are publicly available.

## Affected products

- Edimax EW-7478APC 1.04

## Timeline

- 2026-06-29: disclosed
- 2026-06-29: advisory: Public disclosure of the vulnerability and exploit details.

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-EW-7478APC-formQoS-34b53a41781f8095bffacdea103a82d1](https://lavender-bicycle-a5a.notion.site/EDIMAX-EW-7478APC-formQoS-34b53a41781f8095bffacdea103a82d1)
- [https://vuldb.com/cve/CVE-2026-13580](https://vuldb.com/cve/CVE-2026-13580)
- [https://vuldb.com/submit/844115](https://vuldb.com/submit/844115)
- [https://vuldb.com/vuln/374586](https://vuldb.com/vuln/374586)
- [https://vuldb.com/vuln/374586/cti](https://vuldb.com/vuln/374586/cti)

## Related threats

- [Edimax EW-7478APC command injection in stainfo](https://junglewise.ai/threats/cve-2026-19963-edimax-ew-7478apc-command-injection-in-stainfo)
- [Edimax EW-7478APC command injection in setWAN](https://junglewise.ai/threats/cve-2026-19962-edimax-ew-7478apc-command-injection-in-setwan)
- [Edimax EW-7478APC buffer overflow in wireless site survey](https://junglewise.ai/threats/cve-2026-19961-edimax-ew-7478apc-buffer-overflow-in-wireless-site-survey)
- [Edimax EW-7478APC command injection in formWlbasic](https://junglewise.ai/threats/cve-2026-19960-edimax-ew-7478apc-command-injection-in-formwlbasic)
- [Edimax EW-7478APC stack buffer overflow in WAN configuration](https://junglewise.ai/threats/cve-2026-19959-edimax-ew-7478apc-stack-buffer-overflow-in-wan-configuration)