Vulnerability · Published Apr 19, 2026 · Assigned by VulDB

CVE-2026-6563H3C Magic B1 aspForm SetAPWifiorLedInfoById buffer overflow

High 8.8

In plain English

A high-severity buffer overflow in Magic B1 from H3C. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.5%top 58.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
H3C	Magic B1	100R004

Weakness: CWE-120, CWE-119 · 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

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
https://github.com/K4ptor/H3C-routers-vulnerability/ exploit