CVE-2021-20843 : Cross-site script inclusion vulnerability in the Web GUI of RTX830 Rev.15.02.17

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 16:15:13

Updated 2021-11-30 07:11:11

Source JPCERT/CC

View at NVD, CVE.org

Vulnerability category: File inclusion

Products affected by CVE-2021-20843

Yamaha » Rtx830 Firmware
Versions up to, including, (<=) 15.02.17
cpe:2.3:o:yamaha:rtx830_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Yamaha » Rtx830 » Version: N/A
Yamaha » Nvr510 Firmware
Versions up to, including, (<=) 15.01.18
cpe:2.3:o:yamaha:nvr510_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Yamaha » Nvr510 » Version: N/A
Yamaha » Nvr700w Firmware
Versions up to, including, (<=) 15.00.19
cpe:2.3:o:yamaha:nvr700w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Yamaha » Nvr700w » Version: N/A
Yamaha » Rtx1210 Firmware
Versions up to, including, (<=) 14.01.38
cpe:2.3:o:yamaha:rtx1210_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Yamaha » Rtx1210 » Version: N/A
Ntt-west » Biz Box Rtx830 Firmware
Versions up to, including, (<=) 15.02.17
cpe:2.3:o:ntt-west:biz_box_rtx830_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Ntt-west » Biz Box Rtx830 » Version: N/A
Ntt-west » Biz Box Nvr510 Firmware
Versions before (<) 15.01.18
cpe:2.3:o:ntt-west:biz_box_nvr510_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Ntt-west » Biz Box Nvr510 » Version: N/A
Ntt-west » Biz Box Nvr700w Firmware
Versions up to, including, (<=) 15.00.19
cpe:2.3:o:ntt-west:biz_box_nvr700w_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Ntt-west » Biz Box Nvr700w » Version: N/A
Ntt-west » Biz Box Rtx1210 Firmware
Versions up to, including, (<=) 14.01.38
cpe:2.3:o:ntt-west:biz_box_rtx1210_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Ntt-west » Biz Box Rtx1210 » Version: N/A

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

EPSS FAQ

0.14%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 50 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-20843

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.5	LOW	AV:N/AC:M/Au:S/C:N/I:P/A:N	6.8	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	2.3	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2021-20843

CWE-829 Inclusion of Functionality from Untrusted Control Sphere

The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-20843

https://jvn.jp/en/vu/JVNVU91161784/index.html

JVNVU#91161784: Multiple vulnerabilities in multiple Yamaha routers
Mitigation;Third Party Advisory

CVEs referencing this url
https://business.ntt-east.co.jp/topics/2021/11_09.html

ヤマハルータをご利用のお客さまへ｜お知らせ｜法人のお客さま｜ NTT東日本
Mitigation;Vendor Advisory

CVEs referencing this url
https://www.ntt-west.co.jp/smb/kiki_info/info/211109.html

【NTT西日本】Biz Boxルータをご利用のお客さまへ - 法人・企業向けICTサービス
Mitigation;Vendor Advisory

CVEs referencing this url
http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html

FAQ for YAMAHA RT Series / Security
Mitigation;Vendor Advisory

CVEs referencing this url

Jump to

Vulnerability Details : CVE-2021-20843

Products affected by CVE-2021-20843

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

CVSS scores for CVE-2021-20843

CWE ids for CVE-2021-20843

References for CVE-2021-20843