CVE-2021-20856

Description

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.

Category

5.4
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.21%
Vendor Advisory co.jp
Affected: ELECOM CO.,LTD. ELECOM LAN routers
Published at:
Updated at:

References

Link Tags
https://www.elecom.co.jp/news/security/20211130-01/ vendor advisory
https://jvn.jp/en/jp/JVN88993473/index.html third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-20856?
CVE-2021-20856 has been scored as a medium severity vulnerability.
How to fix CVE-2021-20856?
To fix CVE-2021-20856, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-20856 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-20856 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-20856?
CVE-2021-20856 affects ELECOM CO.,LTD. ELECOM LAN routers.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.