# CVE-2026-13564: Edimax EW-7478APC POST Request formPPPoESetup stack-based overflow

> Remote attackers can trigger a stack-based buffer overflow in the PPPoE setup handler to execute arbitrary code on Edimax access points.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jun 2026
- **Updated:** 29 Jun 2026
- **Also known as:** GHSA-j79x-62f4-fvpw

## What is CVE-2026-13564?

CVE-2026-13564 is a high-severity memory corruption vulnerability in Edimax EW-7478APC, published on 29 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in Edimax EW-7478APC 1.04. Affected is the function formPPPoESetup of the file /goform/formPPPoESetup of the component POST Request Handler. Performing a manipulation of the argument pppUserName results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-121 (Stack-based Buffer Overflow), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-13564?


## How do I fix CVE-2026-13564?

No fix has been published for CVE-2026-13564 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13564 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13564 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13564 and fix it if it is affected.

What it is: CVE-2026-13564 is a high-severity memory corruption vulnerability in Edimax EW-7478APC, published on 29 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-13564 exists.

Affected product: Edimax EW-7478APC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-13564/ (Markdown: https://insights.sbomify.com/CVE-2026-13564/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13564
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13564
- OSV: https://osv.dev/vulnerability/CVE-2026-13564

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13564/
Summaries are generated and may contain mistakes; the official description above is the record.