Security readout for executives and security teams
Plain-English summary
This issue affects Bluetooth Low Energy behavior in Core Specifications 4.0 through 5.2. A nearby device may interfere with unencrypted BLE connections and become a man-in-the-middle. For encrypted BLE links, the cited description says confidentiality and integrity are not compromised, but the link may be terminated.
Executive priority
Prioritize review for environments relying on BLE for access control, medical, industrial, or safety-relevant workflows. Business urgency is lower for encrypted BLE links, but unencrypted BLE links should be treated as nearby tampering risk.
Technical view
CVE-2021-31615 concerns unencrypted BLE baseband links. An adjacent device may inject a crafted packet during the listener receive window before the expected transmitter sends. Sources describe full MITM for unencrypted links. Against encrypted links, crafted packets may terminate the link but should not break confidentiality or integrity.
Likely exposure
Exposure is tied to BLE devices or stacks implementing Bluetooth Core Specifications 4.0 through 5.2, especially where BLE links are unencrypted. The source bundle does not identify specific vendors, models, operating systems, or patches.
Exploitation context
The attacker must be adjacent and within Bluetooth range. The provided sources do not show CISA KEV listing or active exploitation evidence. The practical impact is highest for unauthenticated or unencrypted BLE workflows carrying sensitive commands or data.
Researcher notes
The record is specification-level and lacks CVSS, affected product mapping, and named fixes. Avoid broad product claims without vendor confirmation. The key distinction is MITM potential on unencrypted links versus link termination without confidentiality or integrity compromise on encrypted links.
Mitigation direction
- Check Bluetooth SIG and device-vendor guidance for affected BLE stacks and firmware updates.
- Inventory BLE devices that support Core Specifications 4.0 through 5.2.
- Prefer encrypted and authenticated BLE connections where products support them.
- Treat unencrypted BLE links as unsuitable for sensitive commands or data.
- Monitor vendor advisories for product-specific fixes or configuration guidance.
Validation and detection
- Identify BLE-enabled products, firmware versions, and Bluetooth stack versions in the environment.
- Confirm whether sensitive BLE workflows use encrypted links.
- Review vendor documentation for CVE-2021-31615 applicability and remediation status.
- Assess business processes that depend on unencrypted BLE communications.
- Check for unexplained BLE link terminations on critical devices.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-31615 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://bluetooth.com/CVE reference · x_refsource_MISC
- https://www.bluetooth.com/learn-about-bluetooth/key-attributes/bluetooth-security/injectable/CVE 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.