CVE-2023-24155Public exploitNetwork attack vector

Root access via hard-coded Telnet credentials

Published Feb 3, 2023 · Updated Mar 26, 2025

Hard-coded credentials in TOTOLINK T8 firmware 4.1.5cu allow remote attackers to gain root access through the Telnet service. An unauthenticated POST to /cgi-bin/cstecgi.cgi sets telnet_enabled to 1, after which the firmware accepts the fixed root password stored in /web_cste/cgi-bin/product.ini. Network reachability to the management endpoint and Telnet service is sufficient; successful login grants a root shell with full device control.

CVSS severity9.8
Critical
EPSS probability0.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in TOTOLINK T8 firmware 4.1.5cu allow remote attackers to gain root access through the Telnet service. An unauthenticated POST to /cgi-bin/cstecgi.cgi sets telnet_enabled to 1, after which the firmware accepts the fixed root password stored in /web_cste/cgi-bin/product.ini. Network reachability to the management endpoint and Telnet service is sufficient; successful login grants a root shell with full device control.

The record

CVE
CVE-2023-24155
Published
Feb 3, 2023
Updated
Mar 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-798Use of Hard-coded Credentials
T1078.001Valid Accounts: Default Accounts

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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