CVE-2021-20843

MEDIUM
5.4
CVSS Score
Published: November 24, 2021 at 08:25 AM UTC
Updated: June 17, 2026 at 03:34 AM UTC
16 products affected across 2 vendorsNVR510 FirmwareRTX830 FirmwareRTX1210 Firmware

Using RTX830, NVR510, NVR700W, RTX1210 by Yamaha Corporation?

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.7%

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 15.01.18
Affected range stops below 15.01.18, so it looks safe — our inference, not a vendor statement
ntt-west-biz-box-nvr510 (same device)
v ≤ 15.00.19
ntt-west-biz-box-nvr700w (same device)
v ≤ 14.01.38
ntt-west-biz-box-rtx1210 (same device)
v ≤ 15.02.17
ntt-west-biz-box-rtx830 (same device)
v ≤ 15.01.18
yamaha-nvr510 (same device)
v ≤ 15.00.19
yamaha-nvr700w (same device)
v ≤ 14.01.38
yamaha-rtx1210 (same device)
v ≤ 15.02.17
yamaha-rtx830 (same device)
v ≤ 15.02.17
v ≤ 15.02.17

References (4)

x_refsource_MISCMitigationVendor Advisory
https://business.ntt-east.co.jp/topics/2021/11_09.html
x_refsource_MISCMitigationThird Party Advisory
https://jvn.jp/en/vu/JVNVU91161784/index.html

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-829

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