CVE-2023-40896Public exploitNetwork attack vector

Service crash via SetIpMacBind stack overflow

Published Aug 24, 2023 · Updated Oct 3, 2024

A stack overflow in Tenda AC8 v4.0 firmware si_V16.03.34.06_cn allows remote attackers to interrupt service via /goform/SetIpMacBind. The endpoint mishandles untrusted list and bindnum parameters in stack storage, allowing oversized input to overwrite the stack. The record does not establish code execution or authentication requirements; impact beyond a possible service crash is therefore not publicly bounded.

CVSS severity9.8
Critical
EPSS probability1.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A stack overflow in Tenda AC8 v4.0 firmware si_V16.03.34.06_cn allows remote attackers to interrupt service via /goform/SetIpMacBind. The endpoint mishandles untrusted list and bindnum parameters in stack storage, allowing oversized input to overwrite the stack. The record does not establish code execution or authentication requirements; impact beyond a possible service crash is therefore not publicly bounded.

The record

CVE
CVE-2023-40896
Published
Aug 24, 2023
Updated
Oct 3, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8 v4.0
Classifications
CWE-121, T1190
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 exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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