CVE-2021-20608
CVE-2021-20608 is a high-severity vulnerability in Mitsubishielectric Gx Works2 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v2: 5.0
- EPSS exploit prediction: 3% (84th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Mitsubishielectric Gx Works2
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2021-20608?
- 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.
- How severe is CVE-2021-20608?
- CVE-2021-20608 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2021-20608 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-20608?
- CVE-2021-20608 affects Mitsubishielectric Gx Works2. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-20608?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-20608 published?
- CVE-2021-20608 was published on 2021-12-17 and last updated on 2026-06-17.
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
Affected products (1)
- cpe:2.3:a:mitsubishielectric:gx_works2:*:*:*:*:*:*:*:*
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