CVE intelligence and bounded remediation

CVE-2025-55895 — Totolink A3300R Firmware security vulnerability

Critical CVSS 9.1

TOTOLINK A3300R V17.0.0cu.557_B20221024 and N200RE V9.3.5u.6448_B20240521 and V9.3.5u.6437_B20230519 are vulnerable to Incorrect Access Control. Attackers can send payloads to the interface without logging in (remote).

Severity
Critical
CVSS
9.1 (3.1)
Published
2025-12-15
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-284

Affected products

  • totolink / a3300r_firmware / 17.0.0cu.557_b20221024
  • totolink / n200re_firmware / 9.3.5u.6437_b20230519

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

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Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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