What is CVE-2020-20657?

CVE-2020-20657 is a high-severity vulnerability in Libiec Iccp Mod Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-02.

How severe is CVE-2020-20657?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Libiec Iccp Mod Project

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.

Vulnerability class: Buffer Overflow

Published 2021-11-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (62.1th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 62.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Libiec Iccp Mod Project — versions 1.5

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

github.com/fcovatti/libiec_iccp_mod/issues/1 (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-20657?: CVE-2020-20657 is a high-severity vulnerability in Libiec Iccp Mod Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-02.
How severe is CVE-2020-20657?: High severity. CVSS v3 base score is 7.5 out of 10.