How severe is CVE-2021-34147?

CVE-2021-34147 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-34147 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34147?

CVE-2021-34147 affects Cypress Wireless Internet Connectivity For Embedded Devices. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34147?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34147 published?

CVE-2021-34147 was published on 2021-09-07 and last updated on 2026-06-17.

CVE-2021-34147

CVE-2021-34147 is a medium-severity vulnerability in Cypress Wireless Internet Connectivity For Embedded Devices with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.1
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cypress Wireless Internet Connectivity For Embedded Devices
Published: 2021-09-07
Last modified: 2026-06-17

Description

The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.

Frequently asked questions

What is CVE-2021-34147?: The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 does not properly handle the reception of a malformed LMP timing accuracy response followed by multiple reconnections to the link slave, allowing attackers to exhaust device BT resources and eventually trigger a crash via multiple attempts of sending a crafted LMP timing accuracy response followed by a sudden reconnection with a random BDAddress.
How severe is CVE-2021-34147?: CVE-2021-34147 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-34147 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34147?: CVE-2021-34147 affects Cypress Wireless Internet Connectivity For Embedded Devices. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34147?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34147 published?: CVE-2021-34147 was published on 2021-09-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:cypress:wireless_internet_connectivity_for_embedded_devices:*:*:*:*:*:*:*:*

More vulnerabilities in Cypress Wireless Internet Connectivity For Embedded Devices

CVE-2021-34148 — Medium (CVSS 6.5): The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not…
CVE-2021-34145 — Medium (CVSS 5.3): The Bluetooth Classic implementation in the Cypress WICED BT stack through 2.9.0 for CYW20735B1 devices does not…

All CVEs affecting Cypress Wireless Internet Connectivity For Embedded Devices →