PT-2021-20188 · Phoenix Contact · Phoenix Contact Classic Line Controllers Ilc1X1+1

The Industrial · Published 2021-06-25 · Updated 2021-07-02 · CVE-2021-33541

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions Phoenix Contact Classic Line Controllers ILC1x0 and ILC1x1 (affected versions not specified)

Description The issue is related to a Denial-of-Service condition where the communication protocols and device access lack authentication measures. Remote attackers can exploit this by sending specially crafted IP packets to cause a denial of service on the PLC's network communication module, effectively stopping all network communication. The automation task remains unaffected. To restore network connectivity, the device must be restarted.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2021-33541

Affected Products

Phoenix Contact Classic Line Controllers Ilc1X0

Phoenix Contact Classic Line Controllers Ilc1X1

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2021-33541 · Security Note
• https://t.me/cvenotify/16755 · Telegram Post
• https://cert.vde.com/en-us/advisories/vde-2021-019 · Note