Security readout for executives and security teams
Plain-English summary
This is a Huawei HW_KEYMASTER memory handling flaw affecting HarmonyOS 2.0 and EMUI 12.0.0. The reported impact is out-of-bounds memory access with high confidentiality impact. For executives, treat affected Huawei device fleets as needing update verification, but the public record does not show active exploitation.
Executive priority
Prioritize remediation during the next security update cycle for affected Huawei devices, with faster action for sensitive or externally reachable deployments. The urgency is high because the reported confidentiality impact is high, but no cited source confirms active exploitation.
Technical view
CVE-2021-46868 is described as a memory release problem in Huawei HW_KEYMASTER, mapped to CWE-125. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, unchanged scope, and high confidentiality impact only.
Likely exposure
Exposure is limited to Huawei systems running HarmonyOS 2.0 or EMUI 12.0.0 that include the HW_KEYMASTER module. The provided sources do not identify specific device models or deployment conditions.
Exploitation context
The CVE is not marked KEV, and the provided sources do not state active exploitation or public weaponization. The CVSS vector indicates potentially remote, unauthenticated reachability, but public technical detail is limited.
Researcher notes
Public details are sparse: the issue is a HW_KEYMASTER memory release flaw causing out-of-bounds memory access. Avoid assuming affected models, exploit primitives, or patch mechanics beyond Huawei bulletin guidance and the listed affected OS versions.
Mitigation direction
- Inventory Huawei devices running HarmonyOS 2.0 or EMUI 12.0.0.
- Check Huawei January 2023 security bulletin guidance for applicable updates.
- Apply vendor-provided firmware or OS security updates through official channels.
- If updates are unavailable, request model-specific guidance from Huawei support.
- Prioritize devices exposed to untrusted networks or handling sensitive data.
Validation and detection
- Confirm OS version on Huawei devices against affected versions.
- Verify installed security patch level includes Huawei January 2023 fixes.
- Review asset records for Huawei HarmonyOS and EMUI endpoints.
- Monitor vendor advisories for model-specific correction details.
- Document devices without available updates for risk acceptance or replacement.
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-125: 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 lookupCVE-2021-46868 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.