What is CVE-2021-20710?

CVE-2021-20710 is a medium-severity vulnerability in Aterm Wg2600hs, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-26.

How severe is CVE-2021-20710?

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

XSS in Aterm Wg2600hs

CVE-2021-20710

Cross-site scripting vulnerability in Aterm WG2600HS firmware Ver1.5.1 and earlier allows remote attackers to inject an arbitrary script via unspecified vectors.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-04-26 · 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: 0.008 (54.1th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Aterm Wg2600hs
Aterm Wg2600hs Firmware
Nec Corporation Aterm Wg2600hs — versions firmware Ver1.5.1 and earlier

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

jpn.nec.com/security-info/secinfo/nv21-010.html (Third Party Advisory)
jvn.jp/en/jp/JVN29739718/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2021-20710?: CVE-2021-20710 is a medium-severity vulnerability in Aterm Wg2600hs, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-04-26.
How severe is CVE-2021-20710?: Medium severity. CVSS v3 base score is 6.1 out of 10.