CVE-2021-33541
7.5 · HIGHOverview
CVE-2021-33541 is a high-severity vulnerability affecting phoenixcontact ilc1x0_firmware. It was published on June 25, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from phoenixcontact. Update ilc1x0_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
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Frequently Asked Questions
What is CVE-2021-33541?
CVE-2021-33541 is a high-severity vulnerability affecting phoenixcontact ilc1x0_firmware. It was published on June 25, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-33541?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-33541?
Check the references section for vendor advisories and patches from phoenixcontact. Update ilc1x0_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-33541?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-33541 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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