What is CVE-2021-20862?

CVE-2021-20862 is a medium-severity vulnerability in Elecom Edwrc-2533gst2. CVSS score: 4.3/10. Published 2021-12-01.

How severe is CVE-2021-20862?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Elecom Edwrc-2533gst2

CVE-2021-20862

Improper access control vulnerability in ELECOM routers (WRC-1167GST2 firmware v1.25 and prior, WRC-1167GST2A firmware v1.25 and prior, WRC-1167GST2H firmware v1.25 and prior, WRC-2533GS2-B firmware v1.52 and prior, WRC-2533GS2-W firmware v1.52 and prior, WRC-1750GS firmware v1.03 and prior, WRC-1750GSV firmware v2.11 and prior, WRC-1900GST firmware v1.03 and prior, WRC-2533GST firmware v1.03 and prior, WRC-2533GSTA firmware v1.03 and prior, WRC-2533GST2 firmware v1.25 and prior, WRC-2533GST2SP firmware v1.25 and prior, WRC-2533GST2-G firmware v1.25 and prior, and EDWRC-2533GST2 firmware v1.25 and prior) allows a network-adjacent unauthenticated attacker to bypass access restriction, and to obtain anti-CSRF tokens and change the product's settings via unspecified vectors.

Published 2021-12-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.004 (29.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.9% 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

References

www.elecom.co.jp/news/security/20211130-01/ (Vendor Advisory)
jvn.jp/en/vu/JVNVU94527926/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20862?: CVE-2021-20862 is a medium-severity vulnerability in Elecom Edwrc-2533gst2. CVSS score: 4.3/10. Published 2021-12-01.
How severe is CVE-2021-20862?: Medium severity. CVSS v3 base score is 4.3 out of 10.