CVE-2021-20987

Name: CVE-2021-20987
Creator: NVD / NIST
Published: 2021-02-16T17:15:12.973+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.6/10EPSS 1.10%

Last modified Jun 17, 2026

CVE-2021-20987 is a high-severity vulnerability rated 8.6/10 on the CVSS scale. A denial of service and memory corruption vulnerability was found in Hilscher EtherNet/IP Core V2 prior to V2.13.0.21that may lead to code injection through network or make devices crash without recovery.. EPSS estimates a 1.10% chance of exploitation in the next 30 days.

Description

A denial of service and memory corruption vulnerability was found in Hilscher EtherNet/IP Core V2 prior to V2.13.0.21that may lead to code injection through network or make devices crash without recovery.

Metrics

CVSS 3.1

8.6/10

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

EPSS Probability

1.10%

61.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Hilscher	Ethernet\/Ip Adapter Firmware	>= 2.0, < 2.13.0.21
Pepperl-Fuchs	Wcs Firmware	<= 1.2.1
Pepperl-Fuchs	Pxv100-F200-B25-V1d Firmware	<= 1.10.0
Pepperl-Fuchs	Pxv100i-F200-B25-V1d Firmware	<= 1.10.0
Pepperl-Fuchs	Pcv100-F200-B25-V1d-6011-6720 Firmware	<= 1.10.0
Pepperl-Fuchs	Pcv50-F200-B25-V1d Firmware	<= 1.10.0
Pepperl-Fuchs	Pcv80-F200-B25-V1d Firmware	<= 1.10.0
Pepperl-Fuchs	Pcv100-F200-B25-V1d-6011 Firmware	<= 1.10.0

References

https://cert.vde.com/en-us/advisories/vde-2021-007Third Party Advisory
https://kb.hilscher.com/pages/viewpage.action?pageId=108969480Vendor Advisory
https://cert.vde.com/en-us/advisories/vde-2021-007Third Party Advisory
https://kb.hilscher.com/pages/viewpage.action?pageId=108969480Vendor Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-20987?

How severe is CVE-2021-20987?

CVE-2021-20987 has a CVSS score of 8.6/10 (HIGH severity). The EPSS model estimates a 1.10% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20987?

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-2021-20987?

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

Scan your code now

Source: NVD / NIST