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CVE-2021-20608

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-12-17 · updated 2026-06-17

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.

Affected products

• Mitsubishi Electric Corporation GX Works2: through 1.606g

References

• https://jvn.jp/vu/JVNVU93019896/index.html
• https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf
• https://jvn.jp/vu/JVNVU93019896/index.html
• https://us-cert.cisa.gov/ics/advisories/icsa-21-350-04
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-020_en.pdf

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