Buffer Overflow Vulnerability in H3C Magic B1 Router
CVE-2026-6563

8.7HIGH

Key Information:

Vendor

H3c
Status
Magic B1
Vendor
CVE Published:
19 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-6563?

A buffer overflow vulnerability exists in the functionality of H3C Magic B1 routers, specifically in the SetAPWifiorLedInfoById function located within the /goform/aspForm file. This vulnerability arises from improper handling of input parameters, allowing remote attackers to potentially exploit the buffer overflow and execute arbitrary code. The issue has been publicly disclosed, highlighting the urgency for affected users to implement appropriate security measures to mitigate possible attacks. Despite attempts to notify the vendor, no response has been received regarding this vulnerability.

Affected Version(s)

Magic B1 100R004

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-6563 - Proof of Concept

References

https://vuldb.com/vuln/358200
vdb-entrytechnical-description
https://vuldb.com/vuln/358200/cti
signaturepermissions-required
https://vuldb.com/submit/789531
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

s1incere (VulDB User)
VulDB CNA Team
.