Security readout for executives and security teams
Plain-English summary
CVE-2021-46856 is a Huawei HarmonyOS and EMUI path traversal flaw in the multi-screen collaboration module. An unauthenticated network attacker could potentially access unintended files, creating a confidentiality risk. The sources do not state that integrity or availability are affected.
Executive priority
Treat this as a high-priority confidentiality issue for Huawei mobile or device fleets. Prioritize inventory and patch confirmation, but do not escalate as emergency exploitation without new evidence.
Technical view
The vulnerability is classified as CWE-22 path traversal. The CVSS 3.1 vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N, scoring 7.5. Public sources identify affected HarmonyOS 2.0/3.0.0 and EMUI 12.0.0/12.0.1 releases, but do not provide exploit mechanics.
Likely exposure
Exposure is most relevant for organizations with Huawei devices running the listed HarmonyOS or EMUI versions, especially where multi-screen collaboration is present or enabled.
Exploitation context
The CVE is not listed as CISA KEV in the provided bundle. No cited source claims active exploitation, public exploit availability, or observed campaigns.
Researcher notes
The public bundle is sparse: it identifies product families, versions, CWE, and CVSS, but not vulnerable paths, fixed build numbers, or exploit prerequisites beyond the CVSS vector. Avoid assuming broader Huawei products are affected.
Mitigation direction
- Inventory Huawei devices and identify HarmonyOS or EMUI versions.
- Review Huawei December 2022 and January 2023 bulletins for applicable updates.
- Apply vendor-provided security updates for affected device models and versions.
- Limit exposure of affected devices to untrusted networks where operationally feasible.
- Check vendor guidance before relying on any compensating control.
Validation and detection
- Confirm whether any managed devices run HarmonyOS 2.0 or 3.0.0.
- Confirm whether any managed devices run EMUI 12.0.0 or 12.0.1.
- Map device models to the referenced Huawei security bulletins.
- Verify update installation through device management or local version reporting.
- Document remaining unsupported or unpatched Huawei assets.
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-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-46856 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
- CVE List V5 sourceCVE List V5
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202212-0000001462975397CVE reference
- https://consumer.huawei.com/en/support/bulletin/2023/1/CVE reference
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202301-0000001435541166CVE reference
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 Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.