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CVE Record

CVE-2021-37604: In version 6.5 of Microchip MiWi software and all previous versions including legacy products, there is a p...

In version 6.5 of Microchip MiWi software and all previous versions including legacy products, there is a possibility of frame counters being validated/updated prior to the message authentication. With this vulnerability in place, an attacker may increment the incoming frame counter values by injecting messages with a sufficiently large frame counter value and invalid payload. This results in denial of service/valid packets in the network. There is also a possibility of a replay attack in the stack.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-37604 affects Microchip MiWi software version 6.5 and earlier, including legacy products. The stack may update frame counters before authenticating messages, allowing injected invalid traffic to make valid packets fail and potentially enabling replay behavior. This mainly threatens availability and trust in MiWi wireless networks.

Executive priority

Treat this as a targeted embedded-wireless risk, not an internet-wide emergency based on available evidence. Prioritize environments where MiWi supports safety, access, telemetry, or revenue-critical operations, especially if legacy devices remain deployed.

Technical view

The flaw is an authentication-ordering issue in MiWi frame-counter handling. Incoming frame counter values can be advanced before message authentication succeeds. A sufficiently large unauthenticated counter value can desynchronize valid traffic, causing denial of service, and the CVE also notes a possible replay attack condition.

Likely exposure

Exposure is most likely where Microchip MiWi software 6.5 or earlier, including legacy MiWi deployments, is used in wireless embedded or IoT systems. The bundle does not provide CPEs, CVSS, deployment scope, or a complete affected-product list.

Exploitation context

The sources do not show CISA KEV listing or confirmed active exploitation. The described attacker capability is message injection against a MiWi network, but the bundle does not specify range, prerequisites, tooling, or observed exploitation in the wild.

Researcher notes

Evidence is limited: no CVSS, CWE, CPEs, or detailed advisory text is included in the bundle. The core issue is clear enough for exposure review, but remediation specifics should come from Microchip’s vulnerability response and release documentation.

Mitigation direction

  • Review Microchip’s MiWi vulnerability response for vendor-approved remediation.
  • Identify and prioritize MiWi software 6.5 or earlier deployments.
  • Check ASF release notes and Microchip downloads for relevant updates.
  • Retire or isolate unsupported legacy MiWi products where updates are unavailable.
  • Monitor MiWi networks for counter anomalies, replay indicators, or unexplained packet loss.

Validation and detection

  • Inventory firmware and software versions using MiWi components.
  • Confirm whether deployed stacks update counters only after authentication succeeds.
  • Review vendor notices for exact affected legacy products and update paths.
  • Test fixes in a lab before field rollout.
  • Check operational logs for denial-of-service symptoms in MiWi networks.
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

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CVE-2021-37604 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
6Source 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.