{"id":"CVE-2021-20844","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-20844","generatedAt":"2026-10-28T02:57:45.955Z","title":"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…","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.","published":"2021-11-24T16:15:13.000Z","lastModified":"2026-06-17T03:34:32.000Z","status":"Modified","sourceIdentifier":"vultures@jpcert.or.jp","cvss":{"version":"3.1","score":5.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"},"cwe":["CWE-116"],"affected":["yamaha/rtx830 firmware","yamaha/nvr510 firmware","yamaha/nvr700w firmware","yamaha/rtx1210 firmware","ntt-west/biz box rtx830 firmware","ntt-west/biz box nvr510 firmware","ntt-west/biz box nvr700w firmware","ntt-west/biz box rtx1210 firmware"],"epss":{"score":0.00957,"percentile":0.612,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.96%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html","tags":["Mitigation","Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://business.ntt-east.co.jp/topics/2021/11_09.html","tags":["Mitigation","Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/en/vu/JVNVU91161784/index.html","tags":["Mitigation","Third Party Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://www.ntt-west.co.jp/smb/kiki_info/info/211109.html","tags":["Mitigation","Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"http://www.rtpro.yamaha.co.jp/RT/FAQ/Security/JVNVU91161784.html","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://business.ntt-east.co.jp/topics/2021/11_09.html","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://jvn.jp/en/vu/JVNVU91161784/index.html","tags":["Mitigation","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.ntt-west.co.jp/smb/kiki_info/info/211109.html","tags":["Mitigation","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-20844","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}