Buffer Overflow Vulnerability in H3C Magic B1 Router
CVE-2026-3701

8.7HIGH

Key Information:

Vendor

H3c
Status
Magic B1
Vendor
CVE Published:
8 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3701?

A significant security vulnerability exists in the H3C Magic B1 router, affecting versions up to 100R004. The vulnerability arises from the Edit_BasicSSID_5G function located in the /goform/aspForm file. By manipulating parameters, an attacker can induce a buffer overflow, allowing for potential remote exploitation of the device. This vulnerability has been publicly disclosed, and despite early outreach to the vendor regarding its implications, there has been no acknowledgment or response. Consequently, devices remain at risk if not properly mitigated.

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-2026-3701 - Proof of Concept

References

https://vuldb.com/?id.349647
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349647
signaturepermissions-required
https://vuldb.com/?submit.765771
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

SfTian (VulDB User)
VulDB
.