CVE-2021-20712

Name: CVE-2021-20712
Creator: NVD / NIST
Published: 2021-04-26T01:15:08.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.80%

Last modified Jun 17, 2026

CVE-2021-20712 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier allows a device connected to the LAN side to be accessed from the WAN side due to the defect in the IPv6 firewall function.. EPSS estimates a 0.80% chance of exploitation in the next 30 days.

Description

Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier allows a device connected to the LAN side to be accessed from the WAN side due to the defect in the IPv6 firewall function.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.80%

51.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Nec	Aterm Wg2600hs Firmware	<= 1.5.1
Nec	Aterm Wx3000hp Firmware	<= 1.1.2

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-2021-20712?

How severe is CVE-2021-20712?

CVE-2021-20712 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20712?

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-2021-20712?

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

Scan your code now

Source: NVD / NIST