Auth bypass in Automation Direct Click Plc Cpu Modules: C0-1x Cpus
CVE-2021-32986
After Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 is unlocked by an authorized user, the unlocked state does not timeout. If the programming software is interrupted, the PLC remains unlocked. All subsequent programming connections are allowed without authorization. The PLC is only relocked by a power cycle, or when the programming software disconnects correctly.
EPSS: 0.011 (61.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Automation Direct Click Plc Cpu Modules: C0-1x Cpus — versions unspecified
- Automationdirect C0-10are-d
- Automationdirect C0-10are-d_firmware
- Automationdirect C0-10dd1e-d
- Automationdirect C0-10dd1e-d_firmware
- Automationdirect C0-10dd2e-d
- Automationdirect C0-10dd2e-d_firmware
- Automationdirect C0-10dre-d
- Automationdirect C0-10dre-d_firmware
- Automationdirect C0-11are-d
Weakness classification (CWE)
Public proof-of-concept exploits
References
- ics-cert@hq.dhs.gov (x_refsource_CONFIRM, US Government Resource, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32986?
- CVE-2021-32986 is a critical-severity vulnerability in Automation Direct Click Plc Cpu Modules: C0-1x Cpus, classified under Authentication Bypass Using an Alternate Path or Channel. CVSS score: 9.8/10. Published 2022-04-04.
- How severe is CVE-2021-32986?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-32986 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.