Security readout for executives and security teams
Plain-English summary
This CVE affects Huawei HarmonyOS 2.0. The public record says an unauthorized actor could trigger a flaw in the HwNearbyMain module that may restart a process. The business impact is primarily service disruption, not confirmed data theft.
Executive priority
Prioritize remediation for affected HarmonyOS 2.0 devices that support business operations or sit on untrusted networks. The known impact is availability disruption, and evidence for active exploitation is absent in the provided sources.
Technical view
CVE-2021-39989 is described as sensitive information exposure in HwNearbyMain, but the CVSS vector records no confidentiality or integrity impact and high availability impact. It is network-reachable, low complexity, requires no privileges, and no user interaction.
Likely exposure
Exposure appears limited to Huawei HarmonyOS 2.0 systems containing the HwNearbyMain module. The provided sources do not identify other Huawei products, later HarmonyOS versions, or third-party affected software.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not show active exploitation or public exploit availability. Treat exploitability as plausible because CVSS indicates unauthenticated network access, but operational details are not public here.
Researcher notes
Public evidence is sparse and internally inconsistent: the title mentions information exposure, while CVSS assigns only availability impact. Avoid assuming data disclosure without vendor detail. Validation should focus on affected-version confirmation and vendor advisory mapping.
Mitigation direction
- Inventory Huawei HarmonyOS 2.0 assets and confirm whether they are still supported.
- Review Huawei's referenced November 2021 security bulletin for fixed builds and update guidance.
- Apply vendor-provided security updates where available.
- Reduce unnecessary network exposure for affected devices until vendor guidance is confirmed.
Validation and detection
- Compare device OS versions and patch levels against Huawei's bulletin.
- Confirm whether each asset runs HarmonyOS 2.0 and includes HwNearbyMain.
- Review reliability telemetry for unexplained process restarts on affected devices.
- Document unsupported or unpatchable devices 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
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2021-39989 mapping review
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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: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:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary 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:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://device.harmonyos.com/en/docs/security/update/security-bulletins-202111-0000001217889667CVE 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.
Incorrect Type Conversion or Cast
Incorrect Type Conversion or Cast represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.