CVE intelligence and bounded remediation

CVE-2021-21734 — Some PON MDU devices of ZTE stored sensitive information in plaintext, and users with login authority can obtain it by inputing command

Medium CVSS 6.5

Some PON MDU devices of ZTE stored sensitive information in plaintext, and users with login authority can obtain it by inputing command. This affects: ZTE PON MDU device ZXA10 F821 V1.7.0P3T22, ZXA10 F822 V1.4.3T6, ZXA10 F819 V1.2.1T5, ZXA10 F832 V1.1.1T7, ZXA10 F839 V1.1.0T8, ZXA10 F809 V3.2.1T1, ZXA10 F822P V1.1.1T7, ZXA10 F832 V2.00.00.01

Severity
Medium
CVSS
6.5 (3.1)
Published
2021-05-28
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-312

Affected products

  • zte / zxa10_f821_firmware / 1.7.0p3t22
  • zte / zxa10_f822_firmware / 1.4.3t6
  • zte / zxa10_f819_firmware / 1.2.1t5
  • zte / zxa10_f832_firmware / 1.1.1t7
  • zte / zxa10_f839_firmware / 1.1.0t8
  • zte / zxa10_f809_firmware / 3.2.1t1

Showing 6 representative product identities from 8 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Information disclosure and sensitive data exposure

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace sensitive data through responses, errors, logs, metrics, traces, caches, exports, files, backups, and client bundles.
  • Identify affected subjects, tenants, retention windows, access controls, and downstream copies without opening unnecessary sensitive records.
  • Review metadata, timing, status, length, and existence signals as well as direct content disclosure.

Remediate safely

  • Minimize collection and output, apply field-level authorization and redaction at a centralized boundary, and return generic external errors.
  • Remove secrets and sensitive data from logs, artifacts, URLs, caches, and client-side bundles; rotate credentials that may have been exposed.
  • Update the affected component and add synthetic-data tests for response, error, observability, and export paths.

Authoritative sources

Complete CVE record and remediation plan

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