How severe is CVE-2020-28220?

CVE-2020-28220 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-28220 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-28220?

CVE-2020-28220 primarily affects Schneider-electric Somachine. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-28220?

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

When was CVE-2020-28220 published?

CVE-2020-28220 was published on 2020-12-11 and last updated on 2026-06-17.

CVE-2020-28220

CVE-2020-28220 is a medium-severity vulnerability in Schneider-electric Somachine with a CVSS 3.x base score of 6.8. 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-119.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 5.2
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Schneider-electric Somachine
Published: 2020-12-11
Last modified: 2026-06-17

Description

A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists in Modicon M258 Firmware (All versions prior to V5.0.4.11) and SoMachine/SoMachine Motion software (All versions), that could cause a buffer overflow when the length of a file transferred to the webserver is not verified.

Frequently asked questions

What is CVE-2020-28220?: A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists in Modicon M258 Firmware (All versions prior to V5.0.4.11) and SoMachine/SoMachine Motion software (All versions), that could cause a buffer overflow when the length of a file transferred to the webserver is not verified.
How severe is CVE-2020-28220?: CVE-2020-28220 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-28220 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-28220?: CVE-2020-28220 primarily affects Schneider-electric Somachine. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-28220?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-28220 published?: CVE-2020-28220 was published on 2020-12-11 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2020-343-09/

Affected products (3)

cpe:2.3:o:schneider-electric:modicon_m258_firmware:*:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:somachine:*:*:*:*:*:*:*:*
cpe:2.3:a:schneider-electric:somachine_motion:*:*:*:*:*:*:*:*

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