How severe is CVE-2021-20606?

CVE-2021-20606 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-20606 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-20606?

CVE-2021-20606 primarily affects Mitsubishielectric Ezsocket. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-20606?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-20606 published?

CVE-2021-20606 was published on 2021-12-17 and last updated on 2026-06-17.

CVE-2021-20606

CVE-2021-20606 is a medium-severity vulnerability in Mitsubishielectric Ezsocket with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Mitsubishielectric Ezsocket
Published: 2021-12-17
Last modified: 2026-06-17

Description

Out-of-bounds Read vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.

Frequently asked questions

What is CVE-2021-20606?: Out-of-bounds Read vulnerability in Mitsubishi Electric GX Works2 versions 1.606G and prior, Mitsubishi Electric MELSOFT Navigator versions 2.84N and prior and Mitsubishi Electric EZSocket versions 5.4 and prior allows an attacker to cause a DoS condition in the software by getting a user to open malicious project file specially crafted by an attacker.
How severe is CVE-2021-20606?: CVE-2021-20606 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-20606 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-20606?: CVE-2021-20606 primarily affects Mitsubishielectric Ezsocket. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-20606?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-20606 published?: CVE-2021-20606 was published on 2021-12-17 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:mitsubishielectric:ezsocket:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:gx_works2:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melsoft_navigator:*:*:*:*:*:*:*:*

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