CVE-2021-37604

CVE-2021-37604 is a high-severity vulnerability in Microchip Miwi with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-670.

Key facts

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.

Frequently asked questions

What is CVE-2021-37604?
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.
How severe is CVE-2021-37604?
CVE-2021-37604 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2021-37604 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37604?
CVE-2021-37604 affects Microchip Miwi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-37604?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-37604 published?
CVE-2021-37604 was published on 2021-08-05 and last updated on 2026-06-17.

References

Affected products (1)

More vulnerabilities in Microchip Miwi

All CVEs affecting Microchip Miwi →

Other CWE-670 vulnerabilities

Browse all CWE-670 vulnerabilities →