Resource exhaustion in Phoenix Contact Ilc1x
CVE-2021-33541
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.
EPSS: 0.015 (71.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Phoenix Contact Ilc1x — versions ILC1x0 all variants, ILC1x1 all variants
- Phoenixcontact Ilc1x0
- Phoenixcontact Ilc1x0_firmware
- Phoenixcontact Ilc1x1
- Phoenixcontact Ilc1x1_firmware
Weakness classification (CWE)
References
- info@cert.vde.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33541?
- CVE-2021-33541 is a high-severity vulnerability in Phoenix Contact Ilc1x, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2021-06-25.
- How severe is CVE-2021-33541?
- High severity. CVSS v3 base score is 7.5 out of 10.