Security readout for executives and security teams
Plain-English summary
CVE-2023-0359 is a denial-of-service risk in Zephyr's IPv6 router advertisement handling. A missing null-pointer check can crash affected software paths. It does not indicate data theft or code execution in the supplied sources, but availability impact is rated high under CVSS.
Executive priority
Prioritize for Zephyr-based systems where network availability matters, especially devices reachable from untrusted local networks. This is not a confirmed breach-enabling issue, but crashes in operational devices can still create service impact.
Technical view
The issue is a missing nullptr check in Zephyr's handle_ra_input IPv6 code path, leading to a null pointer dereference. CVSS 3.1 is 5.9 with network attack vector, high attack complexity, no privileges, no user interaction, and availability-only impact.
Likely exposure
Exposure is most likely in Zephyr-based systems that enable IPv6 and process router advertisement input. The supplied bundle does not provide exact affected or fixed version ranges, so inventory validation against Zephyr's advisory is required.
Exploitation context
The CVE is not listed as KEV, and the supplied sources do not report active exploitation. The CVSS vector indicates network reachability but high attack complexity. Treat exploitation evidence as incomplete, not confirmed.
Researcher notes
Evidence supports a null-dereference availability issue in Zephyr IPv6 RA handling. The source bundle lacks fixed-version detail, patch text, and exploit telemetry. Avoid assuming broader products or active exploitation without vendor confirmation.
Mitigation direction
- Review Zephyr advisory GHSA-c7fq-vqm6-v5pf for affected and fixed versions.
- Upgrade Zephyr or backport the vendor fix if your version is affected.
- Limit exposure to untrusted IPv6 router advertisement traffic where feasible.
- Monitor Zephyr security advisories for corrected version guidance.
Validation and detection
- Identify products and firmware builds using Zephyr with IPv6 enabled.
- Compare deployed Zephyr versions against the vendor advisory.
- Confirm whether handle_ra_input or IPv6 router advertisement processing is included.
- Check regression testing for crashes during malformed IPv6 RA handling.
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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2023-0359 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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:U/C:N/I:N/A:H2.23.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.9MediumVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.