{"cve":"CVE-2021-20844","nvd":{"published":"2021-11-24T16:15:13.280","modified":"2026-06-17T03:34:31.840","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N","score":5.7},"cwes":["CWE-116"],"references":["http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html","https://business.ntt-east.co.jp/topics/2021/11_09.html","https://jvn.jp/en/vu/JVNVU91161784/index.html","https://www.ntt-west.co.jp/smb/kiki_info/info/211109.html","http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html"],"products":["ntt-west:biz_box_nvr510_firmware","ntt-west:biz_box_nvr700w_firmware","ntt-west:biz_box_rtx1210_firmware","ntt-west:biz_box_rtx830_firmware","yamaha:nvr510_firmware","yamaha:nvr700w_firmware","yamaha:rtx1210_firmware","yamaha:rtx830_firmware"],"source":"nvd","synced_at":"2026-10-19T21:25:41.256909649+00:00"},"epss":{"cve":"CVE-2021-20844","score":0.00957,"percentile":0.61456,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}