What is CVE-2026-6581?

CVE-2026-6581 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-2026-6581?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in H3c Magic B1

CVE-2026-6581

A vulnerability was detected in H3C Magic B1 up to 100R004. Affected by this vulnerability is the function SetMobileAPInfoById of the file /goform/aspForm. Performing a manipulation of the argument param results in buffer overflow. Remote…

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-358216 | H3C Magic B1 aspForm SetMobileAPInfoById buffer overflow (vdb-entry, technical-description)
VDB-358216 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #790977 | New H3C Magic B1 <=100R004 buffer overflow (third-party-advisory)
github.com/hmKunlun/H3Cc/blob/main/h3c.md (exploit)

Frequently asked questions

What is CVE-2026-6581?: CVE-2026-6581 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-2026-6581?: High severity. CVSS v3 base score is 8.8 out of 10.