CVE-2023-40847Network attack vector

Code execution via unchecked initIpAddrInfo input

Published Aug 30, 2023 · Updated Oct 2, 2024

Buffer overflow in Tenda AC6 firmware 15.03.05.16 allows remote attackers to execute code or crash the router via crafted input. initIpAddrInfo passes a user-controlled value onward without checking its length, allowing a write past the destination buffer. Network access to an affected router is sufficient; exploitation requires neither authentication nor user interaction and can corrupt process memory or interrupt router service.

CVSS severity9.8
Critical
EPSS probability0.68%
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 Tenda AC6 firmware 15.03.05.16 allows remote attackers to execute code or crash the router via crafted input. initIpAddrInfo passes a user-controlled value onward without checking its length, allowing a write past the destination buffer. Network access to an affected router is sufficient; exploitation requires neither authentication nor user interaction and can corrupt process memory or interrupt router service.

The record

CVE
CVE-2023-40847
Published
Aug 30, 2023
Updated
Oct 2, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC6
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 2, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0br_v15.03.05.16_multi_td01.bin

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AC6version=1.0br_v15.03.05.16_multi_td01.bin

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.

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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