Security readout for executives and security teams
Plain-English summary
CVE-2023-1901 affects Zephyr’s Bluetooth HCI host logic. A malicious or compromised HCI controller may be able to crash the host, and the source notes potential code execution. Business urgency is highest for products where Bluetooth controllers, firmware, or attached HCI hardware are untrusted or field-updatable.
Executive priority
Treat as a moderate operational risk. Prioritize embedded products with Bluetooth enabled, especially where controller firmware can be changed outside normal trust controls. Lack of confirmed exploitation lowers urgency, but potential host crash and possible RCE justify timely verification and patch planning.
Technical view
The flaw is a dangling semaphore reference re-use issue in Zephyr’s Bluetooth HCI host layer. The host does not clear a global semaphore reference after synchronous HCI command handling. A malicious HCI controller may trigger use of that stale reference, causing denial of service or potential host-layer RCE.
Likely exposure
Exposure is likely limited to products using Zephyr with the affected Bluetooth HCI host-layer behavior. The supplied bundle names Zephyr but does not provide precise vulnerable or fixed release ranges, so teams must verify against the Zephyr advisory and their SBOMs.
Exploitation context
The CVSS vector indicates adjacent attack vector, high complexity, low privileges, and no user interaction. The provided KEV flag is false, and no supplied source states active exploitation. Practical risk depends on whether an attacker can influence or replace the HCI controller path.
Researcher notes
The supplied evidence is enough to characterize the bug class and attack preconditions, but not enough to name fixed versions or exploit maturity beyond KEV=false. Validate exposure through Zephyr advisory details, build configuration, and product-specific HCI controller trust boundaries.
Mitigation direction
- Check the Zephyr GitHub advisory for affected and fixed release details.
- Update Zephyr to the vendor-recommended fixed version when confirmed.
- Restrict use of untrusted or field-replaceable Bluetooth HCI controllers.
- Disable Bluetooth functionality where it is unnecessary or cannot be remediated.
- Monitor vendor guidance for backports or product-specific mitigations.
Validation and detection
- Inventory products using Zephyr with Bluetooth HCI host support enabled.
- Map firmware and SBOM data to the Zephyr advisory’s affected range.
- Review crash, reset, and Bluetooth controller error logs for anomalies.
- Confirm whether deployed HCI controllers are trusted, signed, and update-controlled.
- Run regression testing after applying the vendor-supported Zephyr update.
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.
CWE-672: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2023-1901 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
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/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:H/PR:L/UI:N/S:U/C:L/I:L/A:H1.24.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Source materials
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.
Operation on a Resource after Expiration or Release
Operation on a Resource after Expiration or Release represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.