CVE-2026-6563Public exploitNetwork attack vector

Authenticated router crash via unchecked param copy

Published Apr 19, 2026 · Updated Apr 19, 2026

Buffer overflow in H3C Magic B1 100R004 allows remote authenticated users to crash the router or execute code through its Web interface. SetAPWifiorLedInfoById copies the param value from POST requests to /goform/aspForm without enforcing a length limit, overflowing its destination buffer. Web-management credentials are required, and WAN management is disabled by default; the public request demonstrates the overflow path but not code execution.

CVSS severity8.8
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in H3C Magic B1 100R004 allows remote authenticated users to crash the router or execute code through its Web interface. SetAPWifiorLedInfoById copies the param value from POST requests to /goform/aspForm without enforcing a length limit, overflowing its destination buffer. Web-management credentials are required, and WAN management is disabled by default; the public request demonstrates the overflow path but not code execution.

The record

CVE
CVE-2026-6563
Published
Apr 19, 2026
Updated
Apr 19, 2026
Vendor
New H3C Technologies Co., Ltd.
Product
H3C Magic B1
Classifications
CWE-120, CWE-119, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=100R004

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

New H3C Technologies Co., Ltd. · H3C Magic B1version=100R004

Published CVSS scores

7.4VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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