CVE-2022-42166Public exploitNetwork attack vector

Unauthenticated router crash via unchecked speed_dir

Published Oct 17, 2022 · Updated May 13, 2025

Stack-based buffer overflow in Tenda AC10 firmware 15.03.06.23 allows remote attackers to crash the router via a crafted HTTP request. The SetSpeedWan handler inserts the controllable speed_dir value into ret_buf with sprintf without checking the destination size. Unauthenticated network access to the web interface is sufficient; the published proof of concept demonstrates a crash, not code execution.

CVSS severity9.8
Critical
EPSS probability0.97%
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 AC10 firmware 15.03.06.23 allows remote attackers to crash the router via a crafted HTTP request. The SetSpeedWan handler inserts the controllable speed_dir value into ret_buf with sprintf without checking the destination size. Unauthenticated network access to the web interface is sufficient; the published proof of concept demonstrates a crash, not code execution.

The record

CVE
CVE-2022-42166
Published
Oct 17, 2022
Updated
May 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 17, 2022CVE publishedPublication date reported by the CVE source.
  2. May 13, 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 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

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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