CVE-2021-20986

Name: CVE-2021-20986
Creator: NVD / NIST
Published: 2021-02-16T17:15:12.817+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.00%

Last modified Jun 17, 2026

CVE-2021-20986 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7. This may lead to unexpected loss of cyclic communication or interruption of acyclic communication.. EPSS estimates a 1.00% chance of exploitation in the next 30 days.

Description

A Denial of Service vulnerability was found in Hilscher PROFINET IO Device V3 in versions prior to V3.14.0.7. This may lead to unexpected loss of cyclic communication or interruption of acyclic communication.

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

1.00%

58.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Hilscher	Profinet Io Device Firmware	>= 3.0, < 3.14.0.7
Pepperl-Fuchs	Pgv100-F200a-B17-V1d Firmware	<= 2.0.0
Pepperl-Fuchs	Pgv150i-F200a-B17-V1d Firmware	<= 2.0.0
Pepperl-Fuchs	Pgv100-F200-B17-V1d-7477 Firmware	<= 2.0.0
Pepperl-Fuchs	Pxv100-F200-B17-V1d Firmware	<= 4.2.0
Pepperl-Fuchs	Pxv100-F200-B17-V1d-3636 Firmware	<= 4.2.0
Pepperl-Fuchs	Pcv80-F200-B17-V1d Firmware	<= 3.2.3
Pepperl-Fuchs	Pcv100-F200-B17-V1d Firmware	<= 3.2.3
Pepperl-Fuchs	Pcv50-F200-B17-V1d Firmware	<= 3.2.3
Pepperl-Fuchs	Pcv100-F200-B17-V1d-6011-6997 Firmware	<= 3.2.3
Pepperl-Fuchs	Pcv100-F200-B17-V1d-6011 Firmware	<= 3.2.5
Pepperl-Fuchs	Pcv100-F200-B17-V1d-6011-8203 Firmware	<= 3.2.5
Pepperl-Fuchs	Pxv100a-F200-B28-V1d Firmware	<= 1.0.3
Pepperl-Fuchs	Pxv100a-F200-B28-V1d-6011 Firmware	<= 1.0.3
Pepperl-Fuchs	Pgv100a-F200-B28-V1d Firmware	<= 1.0.3
Pepperl-Fuchs	Pgv100a-F200a-B28-V1d Firmware	<= 1.0.3
Pepperl-Fuchs	Pgv100aq-F200a-B28-V1d Firmware	<= 2.1.1
Pepperl-Fuchs	Pgv100aq-F200-B28-V1d Firmware	<= 2.1.1
Pepperl-Fuchs	Pxv100aq-F200-B28-V1d Firmware	<= 2.1.1
Pepperl-Fuchs	Pxv100aq-F200-B28-V1d-6011 Firmware	<= 2.1.1
Pepperl-Fuchs	Ohv-F230-B17 Firmware	<= 1.1.0
Pepperl-Fuchs	Oit500-F113b17-Cb Firmware	<= 1.3.4
Pepperl-Fuchs	Pha Firmware	<= 3.1.5
Pepperl-Fuchs	Wcs Firmware	<= 3.0.0

References

https://cert.vde.com/en-us/advisories/vde-2021-006Third Party Advisory
https://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+DeviceVendor Advisory
https://cert.vde.com/en-us/advisories/vde-2021-006Third Party Advisory
https://kb.hilscher.com/display/ISMS/2020-12-03+Denial+of+Service+vulnerability+in+PROFINET+IO+DeviceVendor Advisory

Timeline

Published: Feb 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20986?

How severe is CVE-2021-20986?

CVE-2021-20986 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20986?

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-2021-20986?

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

Scan your code now

Source: NVD / NIST