CVE-2021-20987: Hilscher Ethernet/ip Adapter Firmware

High severity, CVSS 8.6. EPSS: 1.1% chance of exploitation in the next 30 days.

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.

Affected products

• Hilscher Ethernet/ip Adapter Firmware: from 2.0, before 2.13.0.21 (fixed in 2.13.0.21)
• Pepperl-Fuchs PCV100-f200-b25-v1d-6011-6720 Firmware: up to and including 1.10.0
• Pepperl-Fuchs PCV100-f200-b25-v1d-6011 Firmware: up to and including 1.10.0
• Pepperl-Fuchs PCV50-f200-b25-v1d Firmware: up to and including 1.10.0
• Pepperl-Fuchs PCV80-f200-b25-v1d Firmware: up to and including 1.10.0
• Pepperl-Fuchs PXV100-f200-b25-v1d Firmware: up to and including 1.10.0
• Pepperl-Fuchs PXV100I-f200-b25-v1d Firmware: up to and including 1.10.0
• Pepperl-Fuchs Wcs Firmware: up to and including 1.2.1

Published 2021-02-16. Last modified 2026-06-17.