What is CVE-2021-20622?

CVE-2021-20622 is a medium-severity vulnerability in Aterm Wg2600hp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-28.

How severe is CVE-2021-20622?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Aterm Wg2600hp

CVE-2021-20622

Cross-site scripting vulnerability in Aterm WG2600HP firmware Ver1.0.2 and earlier, and Aterm WG2600HP2 firmware Ver1.0.2 and earlier allows remote attackers to inject an arbitrary script via unspecified vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.010 (62.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 63rd percentile — 62.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Aterm Wg2600hp
Aterm Wg2600hp2
Aterm Wg2600hp2 Firmware
Aterm Wg2600hp Firmware
Nec Corporation Aterm Wg2600hp And Wg2600hp2 — versions Aterm WG2600HP firmware Ver1.0.2 and earlier, and Aterm WG2600HP2 firmware Ver1.0.2 and earlier

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.aterm.jp/support/tech/2019/0328.html (Patch, Vendor Advisory)
jpn.nec.com/security-info/secinfo/nv21-005.html (Third Party Advisory)
jvn.jp/en/jp/JVN38248512/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20622?: CVE-2021-20622 is a medium-severity vulnerability in Aterm Wg2600hp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-01-28.
How severe is CVE-2021-20622?: Medium severity. CVSS v3 base score is 6.1 out of 10.