Analyst readout for executives and security teams
Plain-English summary
This is a low-severity availability issue in Zephyr's Bluetooth HCI core. Under specific local conditions requiring user interaction, an error-handling path can dereference a NULL pointer and cause limited disruption. The sources do not show data theft, integrity impact, or confirmed exploitation.
Executive priority
Treat this as a low-priority remediation item unless affected Zephyr-based Bluetooth devices support critical operations. Focus on inventory accuracy, vendor firmware guidance, and normal maintenance windows rather than emergency response.
Technical view
CVE-2020-10066 is a CWE-476 NULL pointer dereference caused by incorrect error handling in Zephyr Bluetooth HCI core. The supplied CVSS 3.1 vector is local, high complexity, no privileges, user interaction required, unchanged scope, and low availability impact only.
Likely exposure
Exposure is most likely in embedded products or firmware that include affected Zephyr versions v1.14.2 or v2.2.0 and enable Bluetooth HCI functionality. The bundle does not identify specific downstream devices, vendors, or deployed product lines.
Exploitation context
The bundle does not support active exploitation, and CISA KEV status is false. CVSS indicates local access, high attack complexity, and required user interaction, limiting broad remote risk. Expected impact is availability disruption rather than confidentiality or integrity compromise.
Researcher notes
Evidence is limited to the CVE metadata and Zephyr advisory reference. Do not infer downstream product exposure from Zephyr alone. Validation should focus on firmware composition, Bluetooth HCI enablement, and vendor-confirmed fixed branches.
Mitigation direction
- Check the Zephyr advisory for fixed versions, backports, or vendor-specific remediation guidance.
- Inventory firmware that embeds Zephyr v1.14.2 or v2.2.0 before prioritizing updates.
- Plan firmware updates through normal product validation once a supported target version is confirmed.
- For high-availability devices, prioritize review where Bluetooth HCI is enabled.
Validation and detection
- Confirm whether products use Zephyr v1.14.2 or v2.2.0.
- Verify whether Bluetooth HCI core functionality is compiled and enabled.
- Review vendor firmware release notes for CVE-2020-10066 or GHSA-gc66-xfrc-24qr references.
- Check product crash telemetry for Bluetooth-related NULL pointer dereference failures.
Public sources used
Based on public source material and reviewed before publication.
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-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-10066 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
- Low
- CVSS
- 2.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
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:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L11.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
2.5LowVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-gc66-xfrc-24qrCVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.