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CVE-2021-31609

22
FAUCET Score

CVE-2021-31609 is a medium-severity vulnerability affecting Silicon Labs iWRAP 6.3.0 and earlier, specifically impacting WT32i devices. An attacker within radio range can trigger a denial-of-service by sending a specially crafted, oversized Bluetooth Classic LMP packet. While there is no known active exploitation or public exploit code, the vulnerability has garnered significant community discussion and media coverage, indicating awareness within the cybersecurity community.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.3.0CPE matchmatch criteria
cpe:2.3:a:silabs:iwrap:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
33.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0041 is in the 51st percentile among its peer group of 1,802 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

dl.packetstormsecurity.net / papers/general/braktooth.pdf
Technical DescriptionThird Party Advisory
silabs.com / wireless/bluetooth/bluegiga-classic-legacy-modules/device.wt32i-a
ProductVendor Advisory