What is CVE-2022-21799?

CVE-2022-21799 is a medium-severity vulnerability in Elecom Wrc-300febk-R, classified under Cross-site Scripting. CVSS score: 5.2/10. Published 2022-02-08.

How severe is CVE-2022-21799?

Medium severity. CVSS v3 base score is 5.2 out of 10.

XSS in Elecom Wrc-300febk-R

CVE-2022-21799

Cross-site scripting vulnerability in ELECOM LAN router WRC-300FEBK-R firmware v1.13 and earlier allows an attacker on the adjacent network to inject an arbitrary script via unspecified vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-02-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (26.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Elecom Wrc-300febk-R
Elecom Wrc-300febk-R Firmware
Elecom Co.,ltd. Lan Router — versions WRC-300FEBK-R firmware v1.13 and earlier

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.elecom.co.jp/news/security/20220208-02/ (Vendor Advisory)
jvn.jp/en/jp/JVN17482543/index.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2022-21799?: CVE-2022-21799 is a medium-severity vulnerability in Elecom Wrc-300febk-R, classified under Cross-site Scripting. CVSS score: 5.2/10. Published 2022-02-08.
How severe is CVE-2022-21799?: Medium severity. CVSS v3 base score is 5.2 out of 10.