CVE-2024-40503Public exploit

Traffic interruption via forged ICMP redirects

Published Jul 16, 2024 · Updated Aug 2, 2024

Improper source verification in Tenda AX12 Firmware 16.03.49.18_cn allows remote attackers on the same LAN to interrupt client traffic. The disclosed routing path accepts a forged ICMP Redirect claiming to come from the gateway, then changes a redirect-accepting client's route to the attacker's address. An attacker must share the LAN with the target client; the demonstrated consequence is loss of that client's connection to its original destination.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper source verification in Tenda AX12 Firmware 16.03.49.18_cn allows remote attackers on the same LAN to interrupt client traffic. The disclosed routing path accepts a forged ICMP Redirect claiming to come from the gateway, then changes a redirect-accepting client's route to the attacker's address. An attacker must share the LAN with the target client; the demonstrated consequence is loss of that client's connection to its original destination.

The record

CVE
CVE-2024-40503
Published
Jul 16, 2024
Updated
Aug 2, 2024
Vendor
Shenzhen Tenda Technology Co., Ltd.
Product
AX12 Firmware
Classifications
CWE-940, T1557
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=16.03.49.18_cn

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Shenzhen Tenda Technology Co., Ltd. · AX12 Firmwareversion=16.03.49.18_cn

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:A/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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-940Improper Verification of Source of a Communication Channel
T1557Adversary-in-the-Middle

Public exploit references

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Technologies

Your stack

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Your stack

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