CVE-2026-3701Public exploitNetwork attack vector

Authenticated code execution via unchecked parameter copy

Published Mar 8, 2026 · Updated Mar 8, 2026

Buffer overflow in H3C Magic B1 firmware 100R004 and earlier allows remote authenticated users to crash the router or execute code. The Edit_BasicSSID_5G handler at /goform/aspForm copies the param field without a length limit, overflowing its destination buffer. Low-privileged Web management access is required; the public request demonstrates denial of service, while code execution is reported but not demonstrated.

CVSS severity8.8
High
EPSS probability0.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Buffer overflow in H3C Magic B1 firmware 100R004 and earlier allows remote authenticated users to crash the router or execute code. The Edit_BasicSSID_5G handler at /goform/aspForm copies the param field without a length limit, overflowing its destination buffer. Low-privileged Web management access is required; the public request demonstrates denial of service, while code execution is reported but not demonstrated.

The record

CVE
CVE-2026-3701
Published
Mar 8, 2026
Updated
Mar 8, 2026
Vendor
New H3C Technologies Co., Ltd.
Product
H3C Magic B1
Classifications
CWE-119, CWE-120, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1210Exploitation of Remote Services

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo