VULNERABILITY INTELLIGENCE

CVE-2021-33541

CVSS score7.5 HIGH
EPSS probability1.49%
CISA KEVNot currently listed
Published2021-06-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Phoenix Contact Classic Line Controllers ILC1x0 and ILC1x1 in all versions/variants are affected by a Denial-of-Service vulnerability. The communication protocols and device access do not feature authentication measures. Remote attackers can use specially crafted IP packets to cause a denial of service on the PLC's network communication module. A successful attack stops all network communication. To restore the network connectivity the device needs to be restarted. The automation task is not affected.

Weakness classification

  • info@cert.vde.com: CWE-770

Primary references