How severe is CVE-2020-18731?

CVE-2020-18731 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-2020-18731 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-2020-18731?

CVE-2020-18731 affects Iec104 Project Iec104. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-18731?

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-2020-18731 published?

CVE-2020-18731 was published on 2021-08-23 and last updated on 2026-06-17.

CVE-2020-18731

CVE-2020-18731 is a high-severity vulnerability in Iec104 Project Iec104 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-476.

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-476
Affected product: Iec104 Project Iec104
Published: 2021-08-23
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is 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).
How severe is CVE-2020-18731?: CVE-2020-18731 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-2020-18731 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-2020-18731?: CVE-2020-18731 affects Iec104 Project Iec104. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-18731?: 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-2020-18731 published?: CVE-2020-18731 was published on 2021-08-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:iec104_project:iec104:1.0:*:*:*:*:*:*:*

More vulnerabilities in Iec104 Project Iec104

CVE-2020-20486 — High (CVSS 7.5): IEC104 v1.0 contains a stack-buffer overflow in the parameter Iec10x_Sta_Addr.
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