Security readout for executives and security teams
Plain-English summary
A malformed JSON response from an UpdateHub server can corrupt memory in Zephyr OS. For businesses shipping Zephyr-based devices, the concern is device crashes or, in the worst case, attacker-controlled code execution. The source bundle does not show active exploitation.
Executive priority
Treat this as high priority for affected connected devices because impact could include outages or code execution. Prioritize externally reachable update paths and products still receiving remote updates.
Technical view
CVE-2020-10022 is a CWE-120 fixed-size buffer copy issue in Zephyr's UpdateHub module. A variable-size hash string from JSON may be copied into a fixed-size array, causing memory corruption. CVSS 3.1 is 9.0 with network attack vector, no privileges, no user interaction, and high complexity.
Likely exposure
Exposure is most likely in embedded products using affected Zephyr versions with UpdateHub functionality enabled or reachable. The bundle names Zephyr 2.1.0 and 2.2.0, while the description also says later versions, so teams should verify exact branches against Zephyr guidance.
Exploitation context
The bundle marks CISA KEV as false and provides no cited evidence of exploitation in the wild. Exploitation would require delivering a malformed JSON payload from an UpdateHub server path, and the CVSS vector rates attack complexity as high.
Researcher notes
Evidence is strong for the vulnerable pattern and impact, but incomplete on exact fixed versions in the prompt. The affected-version wording is inconsistent, so validation should use Zephyr's advisory and referenced PRs rather than assuming only two releases are affected.
Mitigation direction
- Inventory products and firmware builds using Zephyr and UpdateHub.
- Check Zephyr advisory ZEPSEC-28 and linked pull requests for fixed versions.
- Upgrade or backport vendor-confirmed fixes where affected versions are present.
- Restrict trust and network exposure for UpdateHub server communications.
- Monitor vendor advisories for version clarification and downstream firmware updates.
Validation and detection
- Identify Zephyr version and commit in each firmware build.
- Confirm whether UpdateHub is compiled, configured, or reachable.
- Compare local UpdateHub code against linked Zephyr pull requests.
- Review firmware update server trust boundaries and JSON parsing paths.
- Run regression tests for firmware update flows after remediation.
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-2020-10022 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
- Critical
- CVSS
- 9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/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:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9CriticalVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://zephyrprojectsec.atlassian.net/browse/ZEPSEC-28CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/24154CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/24065CVE reference · x_refsource_MISC
- https://github.com/zephyrproject-rtos/zephyr/pull/24066CVE reference · x_refsource_MISC
- https://docs.zephyrproject.org/latest/security/vulnerabilities.html#cve-2020-10022CVE 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.