CVE-2022-40876Public exploitNetwork attack vector

Unauthenticated code execution via unchecked wanSpeed length

Published Oct 27, 2022 · Updated May 7, 2025

Stack-based buffer overflow in Tenda AX1803 1.0.0.1 allows remote attackers to execute code via a crafted HTTP request. The /goform/AdvSetMacMtuWan handler passes an unchecked wanSpeed value to sub_8C6C8, where its length is not validated before it overruns the stack. An unauthenticated POST reaches the handler, and the published proof of concept uses overwritten control data to invoke system with an attacker-supplied command.

CVSS severity9.8
Critical
EPSS probability1.90%
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 AX1803 1.0.0.1 allows remote attackers to execute code via a crafted HTTP request. The /goform/AdvSetMacMtuWan handler passes an unchecked wanSpeed value to sub_8C6C8, where its length is not validated before it overruns the stack. An unauthenticated POST reaches the handler, and the published proof of concept uses overwritten control data to invoke system with an attacker-supplied command.

The record

CVE
CVE-2022-40876
Published
Oct 27, 2022
Updated
May 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 27, 2022CVE publishedPublication date reported by the CVE source.
  2. May 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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-787Out-of-bounds Write
T1059.004Command and Scripting Interpreter: Unix Shell

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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