Security readout for executives and security teams
Plain-English summary
This flaw affects some Intel Wireless Bluetooth and Killer Bluetooth firmware before version 22.100. A nearby authenticated user could trigger a denial of service, disrupting Bluetooth availability. The sources do not indicate data theft, privilege escalation, or active exploitation.
Executive priority
Treat as a moderate endpoint patching issue. It is not described as remotely exploitable over the internet, but it can affect availability on nearby systems and should be remediated through normal device maintenance.
Technical view
CVE-2021-33155 is improper input validation in affected Bluetooth firmware. CVSS 3.1 is 5.7: adjacent attack vector, low complexity, low privileges, no user interaction, and high availability impact only.
Likely exposure
Exposure is most likely on endpoints using Intel Wireless Bluetooth or Killer Bluetooth products with firmware before version 22.100. The attack requires adjacent access and authentication, limiting internet-scale risk.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Practical risk centers on nearby authenticated users causing Bluetooth denial of service.
Researcher notes
The vulnerability is CWE-20 with CVSS vector CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. Validation should focus on product identification and version state, not exploit reproduction.
Mitigation direction
- Identify systems with Intel Wireless Bluetooth or Killer Bluetooth products.
- Update affected firmware or driver packages to version 22.100 or later where available.
- Check Intel and OEM advisories for the approved package for each device model.
- Disable Bluetooth on systems where it is not operationally required.
- Prioritize mobile, shared, and high-availability endpoints using affected adapters.
Validation and detection
- Inventory Bluetooth adapter models and firmware or driver package versions.
- Flag affected Intel or Killer Bluetooth products below version 22.100.
- Confirm updated systems report version 22.100 or later.
- Review endpoint incident history for unexplained Bluetooth availability failures.
- Document exceptions where OEM-approved updates are unavailable.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-33155 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H2.13.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.7MediumVector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00604.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.