CVE-2026-9393Public exploitNetwork attack vector

Authenticated router crash via unchecked param copy

Published May 24, 2026 · Updated May 24, 2026

Buffer overflow in H3C Magic B0 100R002 allows remote authenticated users to crash or reboot the router via a crafted HTTP request. The Edit_BasicSSID_5G handler at /goform/aspForm copies an oversized param value into a fixed-size buffer without checking its length. Access to the Web management interface and valid low-privilege credentials are required; adjacent memory is overwritten, but code execution is not demonstrated.

CVSS severity8.8
High
EPSS probability0.45%
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 B0 100R002 allows remote authenticated users to crash or reboot the router via a crafted HTTP request. The Edit_BasicSSID_5G handler at /goform/aspForm copies an oversized param value into a fixed-size buffer without checking its length. Access to the Web management interface and valid low-privilege credentials are required; adjacent memory is overwritten, but code execution is not demonstrated.

The record

CVE
CVE-2026-9393
Published
May 24, 2026
Updated
May 24, 2026
Vendor
New H3C Technologies Co., Ltd.
Product
H3C Magic B0
Classifications
CWE-119, CWE-120, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2026CVE publishedPublication date reported by the CVE source.
  2. May 24, 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=100R002

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

New H3C Technologies Co., Ltd. · H3C Magic B0version=100R002

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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

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Your stack

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