CVE-2025-5156Network attack vector

Authenticated router compromise via WLAN parameter overflow

Published May 25, 2025 · Updated May 28, 2025

Buffer overflow in H3C Mini GR-5400AX 100R008 allows remote authenticated users to compromise the router through a crafted WLAN request. The EditWlanMacList handler in /routing/goform/aspForm processes the param argument without enforcing the destination buffer's size. Low-privileged management access is required, and successful exploitation compromises router confidentiality, integrity, and availability.

CVSS severity8.7
High
EPSS probability0.86%
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 Mini GR-5400AX 100R008 allows remote authenticated users to compromise the router through a crafted WLAN request. The EditWlanMacList handler in /routing/goform/aspForm processes the param argument without enforcing the destination buffer's size. Low-privileged management access is required, and successful exploitation compromises router confidentiality, integrity, and availability.

The record

CVE
CVE-2025-5156
Published
May 25, 2025
Updated
May 28, 2025
Vendor
New H3C Technologies Co., Ltd.
Product
H3C Mini GR-5400AX
Classifications
CWE-119, CWE-120, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2025CVE publishedPublication date reported by the CVE source.
  2. May 28, 2025Record 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=100R008

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

New H3C Technologies Co., Ltd. · H3C Mini GR-5400AXversion=100R008

Published CVSS scores

8.8VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8VulDBCVSS:3.0/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 exploitUnconfirmed

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')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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