CVE intelligence and bounded remediation

CVE-2021-21725 — A ZTE product has an information leak vulnerability

Medium CVSS 5.7

A ZTE product has an information leak vulnerability. An attacker with higher authority can go beyond their authority to access files in other directories by performing specific operations, resulting in information leak. This affects: ZXHN H196Q V9.1.0C2.

Severity
Medium
CVSS
5.7 (3.1)
Published
2021-03-05
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-863

Affected products

  • zte / zxhn_h196q_firmware / 9.1.0c2

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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