Paper/Archive/CVE-2021-32986

CVE-2021-32986

Automation Direct CLICK PLC CPU Modules: C0-1x CPUs — Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

EPSS 1%CVSS 9.8

critical.is priorityof 100

CVSS 9.8 (CNA, NVD agree)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 66.0.660 × 2013.2 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

CLICK PLC CPU Modules: C0-1x CPUsunspecified – < 3.003.00CNA

Scores by source

icscert (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

refcisa.gov/uscert/ics/advisories/icsa-21-166-02