CVE-2021-20856 json
Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior)…
published 2021-12-01 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-8265
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
Cross-site scripting vulnerability in ELECOM LAN routers (WRH-733GBK firmware v1.02.9 and prior and WRH-733GWH firmware v1.02.9 and prior) allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.
Exploit prediction
0.60% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 3.5 | AV:N/AC:M/Au:S/C:N/I:P/A:N |
Affected products
- ELECOM CO.,LTD. ELECOM LAN routers
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
elecom.co.jp
/news/security/20211130-01/
vendor-advisory
-
jvn.jp
/en/jp/JVN88993473/index.html
third-party-advisory
Sources
- CVE List CVE-2021-20856
- NVD CVE-2021-20856
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