CVE-2020-20657

Name: CVE-2020-20657
Creator: NVD / NIST
Published: 2021-11-02T18:15:07.953+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.99%

Last modified Jun 17, 2026

CVE-2020-20657 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denial of service via an unexpected packet while trying to connect.. EPSS estimates a 0.99% chance of exploitation in the next 30 days.

Description

Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denial of service via an unexpected packet while trying to connect.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.99%

58.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Libiec Iccp Mod Project	Libiec Iccp Mod	1.5

References

https://github.com/fcovatti/libiec_iccp_mod/issues/1Issue Tracking, Third Party Advisory
https://github.com/fcovatti/libiec_iccp_mod/issues/1Issue Tracking, Third Party Advisory

Timeline

Published: Nov 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-20657?

Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denial of service via an unexpected packet while trying to connect.

How severe is CVE-2020-20657?

CVE-2020-20657 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.99% probability of exploitation in the next 30 days.

How do I fix CVE-2020-20657?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-20657?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST