What is CVE-2026-6563?

CVE-2026-6563 is a high-severity vulnerability in H3c Magic B1, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). 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.

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 initi…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (16.9th percentile) — read the EPSS interpretation.

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/E:P/RL:X/RC:R.

Affected products

H3c Magic B1 — versions 100R004

Weakness classification (CWE)

References

VDB-358200 | H3C Magic B1 aspForm SetAPWifiorLedInfoById buffer overflow (vdb-entry, technical-description)
VDB-358200 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #789531 | New H3C Technologies Co., Ltd. Magic B1 Magic B1<=100R004 buffer overflow vulnerability (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 Buffer Copy without Checking Size of Input (Classic Buffer Overflow). 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.