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Verdict

ACTIVELY EXPLOITED (CISA KEV)

What is this: A software vulnerability. (CWE-20: Improper Input Validation) Affects Siemens 6Bk1602-0Aa12-0Tp0 Firmware.
Should you care: Yes — confirmed exploited in the wild (CISA Known Exploited Vulnerabilities). Linked to ransomware campaigns. CVSS 10.0 (critical).
What to do: Patch now.

INVESTIGATEHIGH EVIDENCE COVERAGEDeterministic · stored evidence only

Vulnerability investigation

Actively exploited with known ransomware use

CISA confirms this vulnerability has been exploited in the wild. CISA also records known ransomware campaign use. NVD rates the technical severity critical at CVSS 10.0. These are public vulnerability signals, not proof that a specific environment runs an affected version.

Exploitation status

CISA KEV · exploited in the wild

Added 2021-12-10.

30-day exploitation likelihood

Unavailable

FIRST EPSS did not return a score.

Technical severity

10.0 · critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected surface

85 parsed products

Log4j2, Siemens 6Bk1602-0Aa12-0Tp0 Firmware, Siemens 6Bk1602-0Aa12-0Tp0

Weakness class

CWE-20: Improper Input Validation, CWE-400: Uncontrolled Resource Consumption, CWE-502: Deserialization of Untrusted Data

CWE describes the weakness category, not whether a deployed product is reachable or exploitable.

Corpus evidence

3 connectors · 1144 citations

No related report text is available in the local corpus.

What the evidence supports

Findings stay bounded to named sources and observable infrastructure.

4 findings

Confirmed exploitation in the wild

HIGH

For all affected software assets for which updates exist, the only acceptable remediation actions are: 1) Apply updates; OR 2) remove affected assets from agency networks. Temporary mitigations using one of the measures provided at https://www.cisa.gov/uscert/ed-22-02-apache-log4j-recommended-mitigation-measures are only acceptable until updates are available.

CISA KEV · added 2021-12-10 · action due 2021-12-24

The CISA due date applies to U.S. federal civilian agencies; other organizations should use the action as authoritative remediation guidance, not a universal legal deadline.

Known ransomware campaign use

HIGH

CISA marks this vulnerability as used in known ransomware campaigns.

CISA KEV knownRansomwareCampaignUse = Known

The catalog field does not identify every actor, victim, or campaign using the vulnerability.

What remains unknown

Whether your environment runs an affected product and version is not established by this public lookup.
Reachability, compensating controls, and successful exploitation in a specific environment are not checked.
No locally ingested public report supplies exploit, actor, or campaign context for this CVE.

What this is

CVE-2021-44228 · CWE context (CWE-20)

Evidence readiness

The base CVE appears first. Independent evidence is added without blocking the page.

Investigation status

Checking for newly completed evidence

Refreshing

NIST NVD

NVD evidence is available in this response

Ready

CISA KEV

Listed in the local CISA KEV catalog

Ready

FIRST EPSS

Forensia does not request or publish EPSS while source rights are under review

Rights pending

Reports

Report links are still being resolved

Pending

Relationships

Product and vulnerability relationships are still being prepared

Pending

Vulnerability intel

Local EPSS row, KEV flag, and catalog notes from stored metadata only.

CISA KEV2021-12-10

CVE: CVE-2021-44228
EPSS probability: not fetched / unavailable
EPSS fetched_at: 2026-08-11T10:44:17.711697Z

Added 2021-12-10Federal due date 2021-12-24Known ransomware use

The catalog due date governs U.S. federal civilian agencies; use the action as authoritative remediation guidance, not a universal legal deadline.

related indicators · 14

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cve-2021-44228