How severe is CVE-2020-7564?

CVE-2020-7564 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-7564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7564?

CVE-2020-7564 primarily affects Schneider-electric Modicon Tsxety4103 Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-7564?

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-2020-7564 published?

CVE-2020-7564 was published on 2020-11-18 and last updated on 2026-06-17.

CVE-2020-7564

CVE-2020-7564 is a high-severity vulnerability in Schneider-electric Modicon Tsxety4103 Firmware with a CVSS 3.x base score of 8.8. 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-120.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Schneider-electric Modicon Tsxety4103 Firmware
Published: 2020-11-18
Last modified: 2026-06-17

Description

A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) which could cause write access and the execution of commands when uploading a specially crafted file on the controller over FTP.

Frequently asked questions

What is CVE-2020-7564?: A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) which could cause write access and the execution of commands when uploading a specially crafted file on the controller over FTP.
How severe is CVE-2020-7564?: CVE-2020-7564 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-7564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7564?: CVE-2020-7564 primarily affects Schneider-electric Modicon Tsxety4103 Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-7564?: 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-2020-7564 published?: CVE-2020-7564 was published on 2020-11-18 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2020-315-01/

Affected products (20)

cpe:2.3:o:schneider-electric:modicon_tsxety4103_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_tsxety5103_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_tsxp574634_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_tsxp575634_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_tsxp576634_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140noe77101_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140noe77111_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140noc78100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65150c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65160c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_quantum_140cpu65160_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_p34-2010_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_p34-2030_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_noc_0401_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0100_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0100h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0110_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_noe_0110h_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_bmx_nor_0200h_firmware:*:*:*:*:*:*:*:*

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CVE-2020-7563 — High (CVSS 8.8): A CWE-787: Out-of-bounds Write vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon…
CVE-2020-7562 — High (CVSS 8.1): A CWE-125: Out-of-Bounds Read vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon…

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