CVE intelligence and bounded remediation

CVE-2021-20843 — Yamaha Rtx830 Firmware security vulnerability

Medium CVSS 5.4

Cross-site script inclusion 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 alter the settings of the product via a specially crafted web page.

Severity
Medium
CVSS
5.4 (3.1)
Published
2021-11-24
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-829

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

Supply-chain, dependency, build, and update integrity

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

Check exposure

  • Trace affected packages, source archives, build actions, plugins, installers, and updates from declared source to deployed artifact.
  • Confirm provenance, signatures or digests, namespace ownership, lockfile resolution, registry configuration, and build-runner trust boundaries.
  • Inventory direct, transitive, vendored, generated, and bundled copies across releases and distribution channels.

Remediate safely

  • Move to a maintained trusted artifact or remove the dependency; pin immutable identities and verify provenance and integrity before use.
  • Regenerate lockfiles and artifacts in a clean isolated build, minimize build credentials and network access, and produce an updated software bill of materials.
  • Require reviewed update policy, protected publishing, and reproducible or independently attestable builds where supported.

Authoritative sources

Complete CVE record and remediation plan

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