CVE intelligence and bounded remediation

CVE-2024-35396 — Totolink Cp900L Firmware security vulnerability

Critical CVSS 9.8

TOTOLINK CP900L v4.1.5cu.798_B20221228 was discovered to contain a hardcoded password for telnet in /web_cste/cgi-bin/product.ini, which allows attackers to log in as root.

Severity
Critical
CVSS
9.8 (3.1)
Published
2024-05-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-798, CWE-284

Affected products

  • totolink / cp900l_firmware / 4.1.5cu.798_b20221228

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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