# CVE-2026-13563: Edimax EW-7478APC stack buffer overflow in formL2TPSetup

Source: https://junglewise.ai/threats/cve-2026-13563-edimax-ew-7478apc-stack-buffer-overflow-in-forml2tpsetup  
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-2026-13563 · Severity: high · CVSS 8.8 · Published 2026-06-29

A security vulnerability has been identified in the Edimax EW-7478APC router, a device used to provide wireless networking and internet connectivity. An attacker could exploit this flaw to crash the device or potentially take full control of it by sending a specially crafted request to the router's configuration interface. This could lead to a complete loss of internet availability and unauthorized access to the network traffic passing through the device.

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

## Quick answers

**Is CVE-2026-13563 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-13563 being exploited in the wild.

**How severe is CVE-2026-13563?** 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-2026-13563?** 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-2026-13563 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-13563?** 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 router version 1.04. The flaw is located within the 'formL2TPSetup' function of the '/goform/formL2TPSetup' component, which handles POST requests. By providing a long string to the 'L2TPUserName' argument, an attacker can overflow the stack buffer. This attack can be launched remotely, though it typically requires low-level authentication (PR:L). Successful exploitation could lead to remote code execution (RCE) or a denial of service (DoS) condition. As of the advisory date, the vendor has not responded to the disclosure, and no official patch is available.

## Affected products

- Edimax EW-7478APC 1.04

## Timeline

- 2026-06-29: advisory: NVD publication date
- 2026-06-29: disclosed: Public disclosure of the exploit

## References

- [https://lavender-bicycle-a5a.notion.site/EDIMAX-EW-7478APC-formL2TPSetup-34b53a41781f80f295f8ca2aa55e1226?pvs=73](https://lavender-bicycle-a5a.notion.site/EDIMAX-EW-7478APC-formL2TPSetup-34b53a41781f80f295f8ca2aa55e1226?pvs=73)
- [https://vuldb.com/cve/CVE-2026-13563](https://vuldb.com/cve/CVE-2026-13563)
- [https://vuldb.com/submit/844113](https://vuldb.com/submit/844113)
- [https://vuldb.com/vuln/374571](https://vuldb.com/vuln/374571)
- [https://vuldb.com/vuln/374571/cti](https://vuldb.com/vuln/374571/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)