6.5

CVE-2021-34147: cypress wireless_internet_connectivity_for_embedded_devices

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-34147DEBIAN-CVE-2021-34147
Published 07-09-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-34147 is a medium (CVSS 6.5) vulnerability in cypress wireless_internet_connectivity_for_embedded_devices. EPSS estimates a 0.58% chance of exploitation in the next 30 days, higher than 46.7% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.58%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 07-09-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.58%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

0.00 pp

From 0.58% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Cypress1 product
Debian1 product
  • bluez-firmware< 1.2-8
Ubuntu1 product
  • bluez-firmwareAll versions (No fix recorded)

3 vendors · 3 products

References

6 links