What is CVE-2020-18731?

CVE-2020-18731 is a high-severity vulnerability in Iec104 Project, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-08-23.

How severe is CVE-2020-18731?

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

Is CVE-2020-18731 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

NULL pointer dereference in Iec104 Project

CVE-2020-18731

A segmentation violation in the Iec104_Deal_FirmUpdate function of IEC104 v1.0 allows attackers to cause a denial of service (DOS).

Published 2021-08-23 · 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: 0.014 (71.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Iec104 Project — versions 1.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-18731

References

cwe.mitre.org/data/definitions/476.html (Third Party Advisory)
github.com/airpig2011/IEC104/issues/5 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-18731?: CVE-2020-18731 is a high-severity vulnerability in Iec104 Project, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2021-08-23.
How severe is CVE-2020-18731?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2020-18731 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.