CVE-2020-15158

Name: CVE-2020-15158
Creator: NVD / NIST
Published: 2020-08-26T18:15:10.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.04%

Last modified Jun 17, 2026

CVE-2020-15158 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. In libIEC61850 before version 1.4.3, when a message with COTP message length field with value < 4 is received an integer underflow will happen leading to heap buffer overflow. This can cause an application crash or on some platforms even the execution of remote code. EPSS estimates a 2.04% chance of exploitation in the next 30 days.

Description

In libIEC61850 before version 1.4.3, when a message with COTP message length field with value < 4 is received an integer underflow will happen leading to heap buffer overflow. This can cause an application crash or on some platforms even the execution of remote code. If your application is used in open networks or there are untrusted nodes in the network it is highly recommend to apply the patch. This was patched with commit 033ab5b. Users of version 1.4.x should upgrade to version 1.4.3 when available. As a workaround changes of commit 033ab5b can be applied to older versions.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.04%

78.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mz-Automation	Libiec61850	>= 1.4.0, < 1.4.3

References

https://github.com/mz-automation/libiec61850/commit/033ab5b6488250c8c3b838f25a7cbc3e099230bbPatch, Third Party Advisory
https://github.com/mz-automation/libiec61850/issues/250Third Party Advisory
https://github.com/mz-automation/libiec61850/security/advisories/GHSA-pq77-fmf7-hjw8Third Party Advisory
https://github.com/mz-automation/libiec61850/commit/033ab5b6488250c8c3b838f25a7cbc3e099230bbPatch, Third Party Advisory
https://github.com/mz-automation/libiec61850/issues/250Third Party Advisory
https://github.com/mz-automation/libiec61850/security/advisories/GHSA-pq77-fmf7-hjw8Third Party Advisory

Timeline

Published: Aug 26, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-15158?

How severe is CVE-2020-15158?

CVE-2020-15158 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.04% probability of exploitation in the next 30 days.

How do I fix CVE-2020-15158?

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-2020-15158?

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

Scan your code now

Source: NVD / NIST