CVE-2021-20608

Name: CVE-2021-20608
Creator: NVD / NIST
Published: 2021-12-17T17:15:11.937+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.71%

Last modified Jun 17, 2026

CVE-2021-20608 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote unauthenticated attacker to cause a DoS condition in GX Works2 by getting GX Works2 to read a tampered program file from a Mitsubishi Electric PLC by sending malicious crafted packets to tamper with the program file.. EPSS estimates a 2.71% chance of exploitation in the next 30 days.

Description

Improper Handling of Length Parameter Inconsistency vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior allows a remote unauthenticated attacker to cause a DoS condition in GX Works2 by getting GX Works2 to read a tampered program file from a Mitsubishi Electric PLC by sending malicious crafted packets to tamper with the program file.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.71%

84.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mitsubishielectric	Gx Works2	<= 1.606g

References

https://jvn.jp/vu/JVNVU93019896/index.htmlThird Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdfVendor Advisory
https://jvn.jp/vu/JVNVU93019896/index.htmlThird Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04Third Party Advisory, US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdfVendor Advisory

Timeline

Published: Dec 17, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20608?

How severe is CVE-2021-20608?

CVE-2021-20608 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.71% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20608?

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-2021-20608?

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

Scan your code now

Source: NVD / NIST