Quick answers
- Is CVE-2026-9427 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9427 being exploited in the wild.
- How severe is CVE-2026-9427?
- High severity, with a CVSS score of 8.8, published 25 May 2026.
- Which products and versions are affected?
- Edimax EW-7438RPn 1.31.
- Is there a fix for CVE-2026-9427?
- 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-2026-9427 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9427?
- Check whether you run Edimax EW-7438RPn 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 'webs' binary of the Edimax EW-7438RPn firmware version 1.31. The flaw is located within the 'formWlSiteSurvey' function in the '/goform/formWlSiteSurvey' file. The vulnerability is triggered by failing to validate the length of the 'selSSID' and 'submit-url' HTTP POST parameters before copying them into a fixed-size stack buffer. A remote attacker with low privileges (authenticated access) can exploit this by sending an oversized string in these parameters to overwrite the return address on the stack, leading to arbitrary code execution or a persistent denial of service (device crash). A public exploit has been released, and the vendor has reportedly not responded to disclosure attempts.
Affected products
- Edimax EW-7438RPn 1.31
Timeline
- 2026-05-25: disclosed: Initial public disclosure and CVE assignment