Security readout for executives and security teams
Plain-English summary
CVE-2020-10023 is a buffer overflow in Zephyr RTOS shell handling. An attacker needs physical access and some local privilege, but successful abuse could crash the device or possibly run code inside the Zephyr kernel. This mainly matters for embedded products exposed to hands-on access.
Executive priority
Treat as a targeted embedded-device risk, not an internet-scale emergency. Prioritize products in public, customer, industrial, or hostile physical environments, especially where device compromise could affect safety, operations, or trust.
Technical view
The issue is a CWE-120 buffer overflow in the Zephyr shell subsystem function shell_spaces_trim. The CVSS vector indicates physical attack, high complexity, low privileges, user interaction, changed scope, and high confidentiality, integrity, and availability impact. Affected source data names zephyrproject-rtos Zephyr 1.14.0 and 2.1.0 onward.
Likely exposure
Exposure is likely limited to products using affected Zephyr builds with the shell subsystem reachable through a physical interface such as a console, debug, or service port. Cloud-only services and devices without accessible shell paths are less likely exposed based on the provided sources.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation is constrained by physical access, high attack complexity, low privileges, and user interaction, but the potential kernel impact makes affected field devices worth checking.
Researcher notes
Evidence supports memory corruption in Zephyr kernel context via shell_spaces_trim, with denial of service or possible code execution. The bundle does not provide exact fixed release numbers or exploit details, so validation should focus on build configuration, physical reachability, and vendor patch confirmation.
Mitigation direction
- Review Zephyr vendor guidance for CVE-2020-10023 and referenced upstream pull requests.
- Identify shipped firmware built from Zephyr 1.14.0, 2.1.0, or later affected lines.
- Update affected firmware to a vendor-confirmed fixed Zephyr version or patched downstream release.
- Restrict physical access to service, console, debug, and maintenance interfaces.
- Disable or limit shell subsystem access where operationally safe.
Validation and detection
- Inventory products and firmware builds that include Zephyr RTOS.
- Confirm whether the Zephyr shell subsystem is enabled in each build.
- Check whether physical console, debug, or service interfaces expose shell access.
- Compare downstream source or SBOMs against Zephyr fixes referenced for this CVE.
- Review device crash logs for unexplained shell-related kernel faults.
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-120: 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-2020-10023 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
- 6.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:H/I:H/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:P/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H0.36Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.9MediumVector: CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-29CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/23304CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/23646CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/23649CVE reference · x_refsource_MISC
- https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10023CVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.