CVE-2021-20843

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.

Published: 2021-11-24 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-20843 is rated Low Risk (38.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.67%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-20843

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.28% 0.67% +0.39%
2 2025-11-21 0.23% 0.28% +0.05%
3 2025-11-18 — 0.23% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-20843

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.3 2.7 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2021-20843

Affected software / configurations for CVE-2021-20843

Vendor Product Version Raw CPE
yamaha rtx830_firmware <= 15.02.17 cpe:2.3:o:yamaha:rtx830_firmware:*:*:*:*:*:*:*:*
yamaha nvr510_firmware <= 15.01.18 cpe:2.3:o:yamaha:nvr510_firmware:*:*:*:*:*:*:*:*
yamaha nvr700w_firmware <= 15.00.19 cpe:2.3:o:yamaha:nvr700w_firmware:*:*:*:*:*:*:*:*
yamaha rtx1210_firmware <= 14.01.38 cpe:2.3:o:yamaha:rtx1210_firmware:*:*:*:*:*:*:*:*
ntt-west biz_box_rtx830_firmware <= 15.02.17 cpe:2.3:o:ntt-west:biz_box_rtx830_firmware:*:*:*:*:*:*:*:*
ntt-west biz_box_nvr510_firmware < 15.01.18 cpe:2.3:o:ntt-west:biz_box_nvr510_firmware:*:*:*:*:*:*:*:*
ntt-west biz_box_nvr700w_firmware <= 15.00.19 cpe:2.3:o:ntt-west:biz_box_nvr700w_firmware:*:*:*:*:*:*:*:*
ntt-west biz_box_rtx1210_firmware <= 14.01.38 cpe:2.3:o:ntt-west:biz_box_rtx1210_firmware:*:*:*:*:*:*:*:*

References for CVE-2021-20843

cvelogic Threat Intelligence