Security readout for executives and security teams
This issue affects Zephyr RTOS Bluetooth handling. An invalid channel map in a CONNECT_IND event can cause a deadlock, reducing availability. The source bundle rates it medium with CVSS 4.0. Business impact is most relevant for embedded or IoT products using affected Zephyr Bluetooth code where service continuity matters. Exposure is likely limited to devices or firmware built with affected Zephyr RTOS versions and Bluetooth functionality. The bundle names zephyrproject-rtos Zephyr v2.5.0 and also says versions >= v2.5.0. Downstream products are not identified in the provided evidence. Treat as a moderate availability risk for Bluetooth-enabled embedded products. Prioritize devices that are field-deployed, hard to reboot, safety-adjacent, or business-critical. It is not evidenced as actively exploited in the provided sources. Mitigation focus: Review the Zephyr security advisory for the vendor-supported fix or version guidance.; Inventory firmware using Zephyr v2.5.0 or later with Bluetooth enabled.; Apply vendor-provided Zephyr updates or downstream device firmware updates when available..
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
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Open ATT&CK lookupCVE-2021-3433 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
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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:L/PR:N/UI:N/S:U/C:N/I:N/A:L2.51.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
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 Check or Handling of Exceptional Conditions
Improper Check or Handling of Exceptional Conditions represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.