Buffer overflow in H3c Magic B1
CVE-2026-6563
A vulnerability has been found in H3C Magic B1 up to 100R004. The affected element is the function SetAPWifiorLedInfoById of the file /goform/aspForm. The manipulation of the argument param leads to buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed to the public 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: 0.005 · newest: 0.008 · change: +0.003
Affected products
- H3c Magic B1 — versions 100R004
Weakness classification (CWE)
References
- vuldb.com/vuln/358200 (technical-description, vdb-entry)
- vuldb.com/vuln/358200/cti (signature, permissions-required)
- vuldb.com/submit/789531 (third-party-advisory)
- github.com/K4ptor/H3C-routers-vulnerability/ (exploit)
Frequently asked questions
- What is CVE-2026-6563?
- CVE-2026-6563 is a high-severity vulnerability in H3c Magic B1, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2026-04-19.
- How severe is CVE-2026-6563?
- High severity. CVSS v3 base score is 8.8 out of 10.