How severe is CVE-2020-7524?

CVE-2020-7524 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-2020-7524 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7524?

CVE-2020-7524 affects Schneider-electric Modicon M218 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7524?

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-2020-7524 published?

CVE-2020-7524 was published on 2020-08-31 and last updated on 2026-06-17.

CVE-2020-7524

CVE-2020-7524 is a high-severity vulnerability in Schneider-electric Modicon M218 Firmware 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. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Schneider-electric Modicon M218 Firmware
Published: 2020-08-31
Last modified: 2026-06-17

Description

Out-of-bounds Write vulnerability exists in Modicon M218 Logic Controller (V5.0.0.7 and prior) which could cause Denial of Service when sending specific crafted IPV4 packet to the controller: Sending a specific IPv4 protocol package to Schneider Electric Modicon M218 Logic Controller can cause IPv4 devices to go down. The device does not work properly and must be powered back on to return to normal.

Frequently asked questions

What is CVE-2020-7524?: Out-of-bounds Write vulnerability exists in Modicon M218 Logic Controller (V5.0.0.7 and prior) which could cause Denial of Service when sending specific crafted IPV4 packet to the controller: Sending a specific IPv4 protocol package to Schneider Electric Modicon M218 Logic Controller can cause IPv4 devices to go down. The device does not work properly and must be powered back on to return to normal.
How severe is CVE-2020-7524?: CVE-2020-7524 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-2020-7524 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7524?: CVE-2020-7524 affects Schneider-electric Modicon M218 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7524?: 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-2020-7524 published?: CVE-2020-7524 was published on 2020-08-31 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2020-224-03/

Affected products (1)

cpe:2.3:o:schneider-electric:modicon_m218_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Schneider-electric Modicon M218 Firmware

CVE-2020-7487 — Critical (CVSS 9.8): A CWE-345: Insufficient Verification of Data Authenticity vulnerability exists which could allow the attacker to…
CVE-2021-22800 — High (CVSS 7.5): A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is…
CVE-2020-7502 — High (CVSS 7.5): A CWE-787: Out-of-bounds Write vulnerability exists in Modicon M218 Logic Controller (Firmware version 4.3 and prior),…
CVE-2020-7488 — High (CVSS 7.5): A CWE-319: Cleartext Transmission of Sensitive Information vulnerability exists which could leak sensitive information…

All CVEs affecting Schneider-electric Modicon M218 Firmware →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →