CVE-2021-20844

MEDIUM
5.7
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
MEDIUM5.7
Exploit prediction
EPSS 1.0%

Description

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.

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
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-116

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