CVE-2024-31814Public exploit

Unauthenticated access via trusted authCode parameter

Published Apr 8, 2024 · Updated Aug 2, 2024

Authentication bypass in TOTOLINK EX200 firmware 4.0.3c.7646_B20201211 allows remote attackers to create a session without credentials. The Form_Login function trusts the user-controlled authCode URL parameter and directs lighttpd to generate a session when its value equals 1. Attackers must reach the device web interface from an adjacent network; the resulting session grants authenticated management access.

CVSS severity8.8
High
EPSS probability8.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in TOTOLINK EX200 firmware 4.0.3c.7646_B20201211 allows remote attackers to create a session without credentials. The Form_Login function trusts the user-controlled authCode URL parameter and directs lighttpd to generate a session when its value equals 1. Attackers must reach the device web interface from an adjacent network; the resulting session grants authenticated management access.

The record

CVE
CVE-2024-31814
Published
Apr 8, 2024
Updated
Aug 2, 2024
Vendor
TOTOLINK
Product
EX200 Firmware
Classifications
CWE-288, T1210
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 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=4.0.3c.7646_b20201211

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TOTOLINK · EX200 Firmwareversion=4.0.3c.7646_b20201211

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:A/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

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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-288Authentication Bypass Using an Alternate Path or Channel
T1210Exploitation of Remote Services

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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