CVE intelligence and bounded remediation

CVE-2021-20844 — Yamaha Rtx830 Firmware security vulnerability

Medium CVSS 5.7

Improper neutralization of HTTP request headers for scripting syntax vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR510 Rev.15.01.18 and earlier, NVR700W Rev.15.00.19 and earlier, and RTX1210 Rev.14.01.38 and earlier allows a remote authenticated attacker to obtain sensitive information via a specially crafted web page.

Severity
Medium
CVSS
5.7 (3.1)
Published
2021-11-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-116

Affected products

  • yamaha / rtx830_firmware
  • yamaha / nvr510_firmware
  • yamaha / nvr700w_firmware
  • yamaha / rtx1210_firmware
  • ntt-west / biz_box_rtx830_firmware
  • ntt-west / biz_box_nvr510_firmware

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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