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CVE Record

CVE-2021-26257: Improper buffer restrictions in firmware for some Intel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R...

Improper buffer restrictions in firmware for some Intel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R) products before version 22.120 may allow an authenticated user to potentially enable denial of service via local access.

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a local denial-of-service issue in firmware for some Intel Wireless Bluetooth and Killer Bluetooth products. A signed-in local user with low privileges could cause Bluetooth-related disruption, potentially affecting device availability rather than confidentiality or data integrity.

Executive priority

Treat as a moderate endpoint maintenance item. It is not described as internet-exploitable, but stale Bluetooth firmware can create avoidable disruption on affected laptops and workstations.

Technical view

CVE-2021-26257 is CWE-119 improper buffer restrictions in Bluetooth firmware before version 22.120. CVSS 3.1 is 5.5, AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating local, low-complexity denial of service with no stated confidentiality or integrity impact.

Likely exposure

Exposure is likely on endpoints using affected Intel Wireless Bluetooth or Killer Bluetooth products with firmware earlier than 22.120. The source bundle does not provide CPEs or a complete model list.

Exploitation context

The CVE requires local access and an authenticated user. The bundle does not show CISA KEV listing or other evidence of active exploitation, and no remote attack path is described.

Researcher notes

Evidence supports local authenticated denial of service only. Avoid expanding scope beyond affected Intel Wireless Bluetooth and Killer Bluetooth products before 22.120 unless Intel or OEM advisories identify specific models.

Mitigation direction

  • Review Intel advisory INTEL-SA-00628 for affected product details.
  • Update affected Bluetooth firmware or driver packages to version 22.120 or later.
  • Prioritize shared, kiosk, lab, and high-availability endpoint fleets.
  • If updates are unavailable, follow Intel or OEM guidance for compensating controls.

Validation and detection

  • Inventory endpoints for Intel Wireless Bluetooth and Killer Bluetooth products.
  • Check installed Bluetooth firmware or driver versions against 22.120.
  • Confirm whether OEM update tools include the Intel Bluetooth fix.
  • Review endpoint crash or availability telemetry for unexplained Bluetooth-related denial-of-service symptoms.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-119: Exact CWE lookup

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cve · low confidence lookup

CVE-2021-26257 mapping review

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

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

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2021-26257Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aIntel(R) Wireless Bluetooth(R) and Killer(TM) Bluetooth(R) productsbefore version 22.120Listed
Weakness

CWE details

CWE-119

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.