CVE-2026-5567Public exploitNetwork attack vector

Authenticated service crash via unchecked strncpy length

Published Apr 5, 2026 · Updated Apr 5, 2026

Buffer overflow in setAdvPolicyData in Tenda M3 Access Controller 1.0.0.10 allows remote authenticated users to crash its web service. The sub_648D4 routine passes strncpy a length derived from the colon position in untrusted rebootTime data without checking the destination buffer size. A valid management session and crafted POST request are required; the demonstrated result is an unresponsive management interface.

CVSS severity8.8
High
EPSS probability0.63%
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 setAdvPolicyData in Tenda M3 Access Controller 1.0.0.10 allows remote authenticated users to crash its web service. The sub_648D4 routine passes strncpy a length derived from the colon position in untrusted rebootTime data without checking the destination buffer size. A valid management session and crafted POST request are required; the demonstrated result is an unresponsive management interface.

The record

CVE
CVE-2026-5567
Published
Apr 5, 2026
Updated
Apr 5, 2026
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
M3 Access Controller
Classifications
CWE-119, CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 5, 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=1.0.0.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · M3 Access Controllerversion=1.0.0.10

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 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')
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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