Security readout for executives and security teams
Plain-English summary
CVE-2021-46867 is a Huawei mobile OS vulnerability in the HW_KEYMASTER module. A memory-release flaw may allow out-of-bounds memory access, with high confidentiality impact. The business priority is identifying affected Huawei HarmonyOS and EMUI devices and applying Huawei guidance.
Executive priority
High priority for organizations with Huawei mobile endpoints, especially where devices handle sensitive business data. If Huawei devices are not present, priority drops to inventory confirmation and routine monitoring.
Technical view
The CVE describes CWE-125 out-of-bounds memory access in Huawei HW_KEYMASTER. Listed affected products are HarmonyOS 2.0 and EMUI 12.0.0. CVSS 3.1 is 7.5 with network attack vector, low complexity, no privileges, no user interaction, and confidentiality impact only.
Likely exposure
Organizations with Huawei phones, tablets, or managed endpoints running HarmonyOS 2.0 or EMUI 12.0.0 are the exposed population. The provided sources do not identify other vendors, models, or services as affected.
Exploitation context
The source bundle does not show CISA KEV listing or any cited evidence of active exploitation. Treat exploitation status as unconfirmed. The CVSS vector indicates remotely reachable conditions, but the public technical detail is limited.
Researcher notes
Public detail is sparse: affected products, versions, CWE-125, CVSS, and Huawei bulletin references are available, but no exploit mechanics or model-level matrix is included in the bundle. Avoid assuming impact beyond confidentiality and out-of-bounds memory access.
Mitigation direction
- Inventory Huawei devices and record HarmonyOS or EMUI versions.
- Review Huawei January 2023 security bulletin guidance for this CVE.
- Install vendor-provided security updates where available for affected devices.
- Prioritize managed, sensitive, or externally exposed mobile fleets.
- Track Huawei advisories for any model-specific remediation details.
Validation and detection
- Confirm no managed Huawei device remains on HarmonyOS 2.0 or EMUI 12.0.0.
- Verify device security patch levels against Huawei bulletin requirements.
- Check MDM inventory for unmanaged or stale Huawei endpoints.
- Document exceptions where updates are unavailable or unsupported.
- Monitor vendor and CVE records for changed affected-version guidance.
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-2021-46867 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.