CVE-2021-20709

Name: CVE-2021-20709
Creator: NVD / NIST
Published: 2021-04-26T01:15:07.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2021-20709 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. Improper validation of integrity check value vulnerability in NEC Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker with an administrative privilege to execute arbitrary OS commands by sending a specially crafted request to a specific URL.. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

Improper validation of integrity check value vulnerability in NEC Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker with an administrative privilege to execute arbitrary OS commands by sending a specially crafted request to a specific URL.

Metrics

CVSS 3.1

7.2/10

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

EPSS Probability

0.66%

46.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-354

Affected Software

Vendor	Product	Versions
Nec	Aterm Wf1200cr Firmware	<= 1.3.2
Nec	Aterm Wg1200cr Firmware	<= 1.3.3
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-2021-20709?

How severe is CVE-2021-20709?

CVE-2021-20709 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20709?

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-2021-20709?

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

Scan your code now

Source: NVD / NIST