CVE-2022-40875Public exploitNetwork attack vector

Unauthenticated denial of service via oversized MAC parameter

Published Oct 27, 2022 · Updated May 7, 2025

Heap overflow in Tenda AX1803 firmware 1.0.0.1 allows remote attackers to interrupt service via a crafted HTTP request. GetParentControlInfo processes a 1,024-byte mac form value at /goform/GetParentControlInfo without rejecting its excessive length, overflowing heap storage. An unauthenticated network request is sufficient to interrupt the router service; the published evidence demonstrates denial of service, not code execution.

CVSS severity7.5
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in Tenda AX1803 firmware 1.0.0.1 allows remote attackers to interrupt service via a crafted HTTP request. GetParentControlInfo processes a 1,024-byte mac form value at /goform/GetParentControlInfo without rejecting its excessive length, overflowing heap storage. An unauthenticated network request is sufficient to interrupt the router service; the published evidence demonstrates denial of service, not code execution.

The record

CVE
CVE-2022-40875
Published
Oct 27, 2022
Updated
May 7, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499
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

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 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
T1499Endpoint Denial of Service

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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