CVE-2023-40897Network attack vector

Unauthenticated memory corruption via unbounded mac input

Published Aug 24, 2023 · Updated Oct 3, 2024

Stack overflow in Tenda AC8 v4.0 firmware 16.03.34.06 allows remote attackers to corrupt memory through crafted mac input. The /goform/GetParentControlInfo handler places the untrusted mac value into a stack buffer without an adequate length boundary; the precise copy operation and buffer size are not public. No authentication or user interaction is required, and memory corruption can crash the router; reliable code execution has not been publicly demonstrated.

CVSS severity9.8
Critical
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Tenda AC8 v4.0 firmware 16.03.34.06 allows remote attackers to corrupt memory through crafted mac input. The /goform/GetParentControlInfo handler places the untrusted mac value into a stack buffer without an adequate length boundary; the precise copy operation and buffer size are not public. No authentication or user interaction is required, and memory corruption can crash the router; reliable code execution has not been publicly demonstrated.

The record

CVE
CVE-2023-40897
Published
Aug 24, 2023
Updated
Oct 3, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8 v4.0
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=si_V16.03.34.06_cn

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC8 v4.0version=si_V16.03.34.06_cn

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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