CVE-2021-20711

Name: CVE-2021-20711
Creator: NVD / NIST
Published: 2021-04-26T01:15:08.03+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2021-20711 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.36%

68.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Nec	Aterm Wg2600hs Firmware	<= 1.5.1

References

https://jpn.nec.com/security-info/secinfo/nv21-010.htmlMitigation, Vendor Advisory
https://jvn.jp/en/jp/JVN29739718/index.htmlThird Party Advisory
https://jpn.nec.com/security-info/secinfo/nv21-010.htmlMitigation, Vendor Advisory
https://jvn.jp/en/jp/JVN29739718/index.htmlThird Party Advisory

Timeline

Published: Apr 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20711?

Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.

How severe is CVE-2021-20711?

CVE-2021-20711 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20711?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20711?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST