CVE-2026-8764Public exploitNetwork attack vector

Authenticated router crash via unchecked parameter copy

Published May 17, 2026 · Updated May 17, 2026

Buffer overflow in H3C Magic B3 100R002 and earlier allows remote authenticated users to crash or reboot the router via a crafted param value. UpdateWanParams accepts param values shorter than 512 bytes, then copies them into a 64-byte destination array without checking that boundary. High-privileged access to the web management interface is required; demonstrated consequences include management-service failure and abnormal device behavior, while code execution remains unverified.

CVSS severity7.2
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 B3 100R002 and earlier allows remote authenticated users to crash or reboot the router via a crafted param value. UpdateWanParams accepts param values shorter than 512 bytes, then copies them into a 64-byte destination array without checking that boundary. High-privileged access to the web management interface is required; demonstrated consequences include management-service failure and abnormal device behavior, while code execution remains unverified.

The record

CVE
CVE-2026-8764
Published
May 17, 2026
Updated
May 17, 2026
Vendor
New H3C Technologies Co., Ltd.
Product
Magic B3
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 17, 2026CVE publishedPublication date reported by the CVE source.
  2. May 17, 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 privilegesadmin

What is affected?

New H3C Technologies Co., Ltd. · Magic B3version=100R002

Published CVSS scores

8.3VulDBAV:N/AC:L/Au:M/C:C/I:C/A:C
7.2VulDBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

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
Privilegesadmin
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
T1499.004Application or System Exploitation

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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