CVE-2023-40893Public exploitNetwork attack vector

Router crash via PowerSaveSet time overflow

Published Aug 24, 2023 · Updated Oct 3, 2024

Stack-based buffer overflow in Tenda AC8 v4.0 firmware si_V16.03.34.06_cn allows remote attackers to crash the router. Public records identify the /goform/PowerSaveSet handler and its untrusted time parameter but do not disclose the specific unsafe copy or parsing operation. No authentication or user interaction is required; a successful request crashes the device and interrupts routing service.

CVSS severity9.8
Critical
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda AC8 v4.0 firmware si_V16.03.34.06_cn allows remote attackers to crash the router. Public records identify the /goform/PowerSaveSet handler and its untrusted time parameter but do not disclose the specific unsafe copy or parsing operation. No authentication or user interaction is required; a successful request crashes the device and interrupts routing service.

The record

CVE
CVE-2023-40893
Published
Aug 24, 2023
Updated
Oct 3, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AC8 v4.0
Classifications
CWE-787, T1499.004, 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?

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

  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

9.8NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation
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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