CVE-2021-32986

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-04-05. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
61.3%
KEV
Not listed

Published

April 4, 2022

Last Modified

November 21, 2024

Advisory Details (1)

Auto-updated Jun 21, 2026
Patch available. Sources: cisa.
cisa Patch Available

Automation Direct CLICK PLC CPU Modules | CISA

https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02

Weakness Classification(3)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 13× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-22 22:48 UTCEG score recompute
  2. 2026-07-22 14:06 UTCEPSS rescore
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  72. 2026-05-26 00:32 UTCEG score recompute
  73. 2026-05-26 00:32 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-32986?
CVE-2021-32986 is a critical vulnerability published on April 4, 2022. 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…
When was CVE-2021-32986 disclosed?
CVE-2021-32986 was first published in the National Vulnerability Database on April 4, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-32986 actively exploited?
CVE-2021-32986 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-32986?
CVE-2021-32986 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-32986?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-32986, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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