Security readout for executives and security teams
Plain-English summary
This flaw is in Zephyr RTOS, used in embedded and IoT firmware. If low-privileged code is already running on an affected device, weak syscall argument checks in the Kscan subsystem may let it gain higher privileges. It is serious for devices that allow userspace apps or plugins.
Executive priority
Treat this as high priority for embedded products that permit local apps, scripts, plugins, or third-party code. It is lower urgency for locked-down devices with no userspace extensibility, but still requires tracking because impact after local code execution is high.
Technical view
CVE-2020-10058 is CWE-20 improper input validation in multiple Kscan syscalls. The CVSS vector is local, high complexity, low privileges, no user interaction, scope changed, with high confidentiality, integrity, and availability impact. The source bundle identifies Zephyr 2.1.0 and later as affected.
Likely exposure
Exposure is most likely in products or firmware built on Zephyr 2.1.0 or later where the Kscan subsystem and userspace syscall interface are present. This is not described as a remote network vulnerability in the provided sources.
Exploitation context
The provided data does not show CISA KEV listing or active exploitation. Exploitation requires existing local low-privileged code execution and high complexity, but successful exploitation could cross privilege boundaries and affect device confidentiality, integrity, and availability.
Researcher notes
The bundle names Kscan syscall argument validation as the root issue and references NCC-ZEP-006, Zephyr security tracking, and two Zephyr pull requests. The provided evidence does not include exploit details, fixed version numbers, or confirmed in-the-wild exploitation.
Mitigation direction
- Inventory products and firmware builds using Zephyr RTOS 2.1.0 or later.
- Check Zephyr’s CVE page and linked PRs for supported remediation guidance.
- Prioritize devices that run untrusted or separately privileged userspace code.
- Limit deployment of untrusted userspace components until vendor guidance is applied.
- Rebuild and redeploy affected firmware following Zephyr project guidance.
Validation and detection
- Confirm the exact Zephyr version used in each firmware build.
- Check whether Kscan and userspace syscall support are enabled.
- Review whether local userspace code can run on affected devices.
- Verify remediation against Zephyr’s vulnerability page and referenced pull requests.
- Run product regression tests after rebuilding firmware with vendor-approved changes.
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-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-10058 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/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:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H1.16Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/zephyrproject-rtos/zephyr/pull/23308CVE reference · x_refsource_MISC
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-34CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/23748CVE reference · x_refsource_MISC
- https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10058CVE 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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.