Buffer overflow in Edimax Br-6478ac
CVE-2026-9443
A security vulnerability has been detected in Edimax BR-6478AC 1.23. This vulnerability affects the function formL2TPSetup of the file /goform/formL2TPSetup of the component POST Request Handler. The manipulation of the argument L2TPUserName leads to buffer overflow. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.008 (55.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.008 · change: +0.002
Affected products
- Edimax Br-6478ac — versions 1.23
Weakness classification (CWE)
References
- vuldb.com/vuln/365424 (technical-description, vdb-entry)
- vuldb.com/vuln/365424/cti (signature, permissions-required)
- vuldb.com/submit/818452 (third-party-advisory)
- lavender-bicycle-a5a.notion.site/EDIMAX-BR6478ACV2-formL2TPSetup-34b53a41781f80… (exploit)
Frequently asked questions
- What is CVE-2026-9443?
- CVE-2026-9443 is a high-severity vulnerability in Edimax Br-6478ac, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-05-25.
- How severe is CVE-2026-9443?
- High severity. CVSS v3 base score is 8.8 out of 10.