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CVE Record

CVE-2021-37605: In version 6.5 Microchip MiWi software and all previous versions including legacy products, the stack is va...

In version 6.5 Microchip MiWi software and all previous versions including legacy products, the stack is validating only two out of four Message Integrity Check (MIC) bytes.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE affects Microchip MiWi software where only half of a four-byte integrity check is validated. That can weaken trust in wireless messages. Business impact depends on where MiWi is embedded, especially in older or legacy products, but the public bundle does not provide severity, CVSS, or impact details.

Executive priority

Treat this as an inventory and vendor-assurance priority, not an emergency based on current evidence. Escalate if MiWi is used in safety, operational, or hard-to-update embedded environments.

Technical view

Microchip MiWi software version 6.5 and all previous versions, including legacy products, validates only two of four Message Integrity Check bytes. This reduces the effective integrity check strength. The source bundle does not identify a CWE, CVSS score, exploit prerequisites, affected CPEs, or specific patched version details.

Likely exposure

Exposure is most likely in products or firmware that include Microchip MiWi software version 6.5 or earlier, including legacy MiWi-based deployments. Standard vulnerability scanners may miss this because the affected software is likely embedded in firmware or wireless stack components.

Exploitation context

The provided sources do not report active exploitation, public exploit availability, or CISA KEV listing. Any exploitation assessment should remain tentative until Microchip guidance, product inventory, and firmware provenance are confirmed.

Researcher notes

Key gaps are severity, exploitability, exact affected product mapping, and fixed-version details. The technical issue is shortened MIC validation, but the bundle does not support conclusions about bypass impact, attacker proximity, or practical exploit conditions.

Mitigation direction

  • Inventory products and firmware that use Microchip MiWi software.
  • Check Microchip vulnerability response and release notes for vendor-directed updates.
  • Prioritize review of MiWi version 6.5, earlier, and legacy deployments.
  • Apply only vendor-supported firmware or stack updates.
  • Reduce unnecessary wireless exposure while remediation guidance is confirmed.

Validation and detection

  • Confirm whether deployed firmware includes Microchip MiWi software.
  • Identify MiWi software versions in affected products or build records.
  • Compare findings against Microchip advisory and release documentation.
  • Ask vendors to confirm whether their products include vulnerable MiWi components.
  • Document assets where version provenance cannot be established.
Prepared
Confidence
medium
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-37605 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
7Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.