HOMEVULNERABILITIESCVE-2021-37604
HIGH

CVE-2021-37604

CWE-670Published: August 5, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2021-37604 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

microchip1 product(s)
miwi
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://ww1.microchip.com/downloads/en/DeviceDoc/asf-release-notes-3.50.0.100-readme.pdf
ADVISORYhttps://www.microchip.com/en-us/development-tools-tools-and-software/libraries-code-examples-and-more/advanced-software-framework-for-sam-devices#Downloads
ADVISORYhttps://www.microchip.com/en-us/products/wireless-connectivity/software-vulnerability-response/miwi-software-vulnerability
ADVISORYhttps://www.microchip.com/en-us/products/wireless-connectivity/sub-ghz/miwi-protocol
ADVISORYhttps://www.microchip.com/product-change-notifications/#/
ADVISORYhttps://ww1.microchip.com/downloads/en/DeviceDoc/asf-release-notes-3.50.0.100-readme.pdf
ADVISORYhttps://www.microchip.com/en-us/development-tools-tools-and-software/libraries-code-examples-and-more/advanced-software-framework-for-sam-devices#Downloads
ADVISORYhttps://www.microchip.com/en-us/products/wireless-connectivity/software-vulnerability-response/miwi-software-vulnerability
ADVISORYhttps://www.microchip.com/en-us/products/wireless-connectivity/sub-ghz/miwi-protocol
ADVISORYhttps://www.microchip.com/product-change-notifications/#/

All References (10)

→
https://ww1.microchip.com/downloads/en/DeviceDoc/asf-release-notes-3.50.0.100-readme.pdfRelease Notes · Vendor Advisory
→
https://www.microchip.com/en-us/development-tools-tools-and-software/libraries-code-examples-and-more/advanced-software-framework-for-sam-devices#DownloadsVendor Advisory
→
https://www.microchip.com/en-us/products/wireless-connectivity/software-vulnerability-response/miwi-software-vulnerabilityVendor Advisory
→
https://www.microchip.com/en-us/products/wireless-connectivity/sub-ghz/miwi-protocolVendor Advisory
→
https://www.microchip.com/product-change-notifications/#/Vendor Advisory
→
https://ww1.microchip.com/downloads/en/DeviceDoc/asf-release-notes-3.50.0.100-readme.pdfRelease Notes · Vendor Advisory
→
https://www.microchip.com/en-us/development-tools-tools-and-software/libraries-code-examples-and-more/advanced-software-framework-for-sam-devices#DownloadsVendor Advisory
→
https://www.microchip.com/en-us/products/wireless-connectivity/software-vulnerability-response/miwi-software-vulnerabilityVendor Advisory
→
https://www.microchip.com/en-us/products/wireless-connectivity/sub-ghz/miwi-protocolVendor Advisory
→
https://www.microchip.com/product-change-notifications/#/Vendor Advisory

Quick Facts

CVE IDCVE-2021-37604
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-670
CISA KEVNo
Affected1 vendor(s)
PublishedAug 5, 2021

Related CVEs (CWE-670)

CVE-2020-17466
9.8
CVE-2022-25745
9.8
CVE-2022-21679
9.8
CVE-2019-17192
9.8
CVE-2023-23623
9.8
CVE-2020-1914
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-37604 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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