CVE-2021-20844 json
Improper neutralization of HTTP request headers for scripting syntax vulnerability in the Web GUI of RTX830 Rev.15.02.17 and earlier, NVR51…
published 2021-11-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8254
- cvss
- 5.7
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- ntt-west biz_box_nvr510_firmware 15.01.18
Exploit prediction
0.96% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:P/I:N/A:N |
Affected products
- Yamaha Corporation RTX830, NVR510, NVR700W, RTX1210
Classification
- Weakness
-
- CWE-116 Improper Encoding or Escaping of Output
References
-
ntt-west.co.jp
/smb/kiki_info/info/211109.html
mitigation, vendor-advisory
-
business.ntt-east.co.jp
/topics/2021/11_09.html
mitigation, vendor-advisory
-
rtpro.yamaha.co.jp
/RT/FAQ/Security/JVNVU91161784.html
mitigation, vendor-advisory
-
jvn.jp
/en/vu/JVNVU91161784/index.html
mitigation, third-party-advisory
Sources
- CVE List CVE-2021-20844
- NVD CVE-2021-20844
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