CVE-2022-40854Public exploitNetwork attack vector

Remote code execution via unchecked ssid copy

Published Sep 23, 2022 · Updated May 22, 2025

Stack overflow in Tenda AC18 firmware 15.03.05.19 allows remote attackers to execute code or interrupt service via crafted ssid input. The form_fast_setting_wifi_set handler copies the request's ssid parameter into fixed 64-byte stack buffers with strcpy and no length check, permitting stack corruption. The HTTP management endpoint is network reachable without user interaction according to the published CVSS vector; crafted input can crash the router or provide code execution.

CVSS severity9.8
Critical
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in Tenda AC18 firmware 15.03.05.19 allows remote attackers to execute code or interrupt service via crafted ssid input. The form_fast_setting_wifi_set handler copies the request's ssid parameter into fixed 64-byte stack buffers with strcpy and no length check, permitting stack corruption. The HTTP management endpoint is network reachable without user interaction according to the published CVSS vector; crafted input can crash the router or provide code execution.

The record

CVE
CVE-2022-40854
Published
Sep 23, 2022
Updated
May 22, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 23, 2022CVE publishedPublication date reported by the CVE source.
  2. May 22, 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

9.8NVDCVSS: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
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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