Security readout for executives and security teams
Plain-English summary
CVE-2021-39984 is a Huawei HarmonyOS 2.0 flaw in the idap module that can crash or disrupt service. The public data rates it high because it is network-accessible, needs no login or user action, and can affect availability.
Executive priority
Treat this as a high-priority availability risk for confirmed HarmonyOS 2.0 environments, especially where device downtime affects operations. It is not described as data theft or code execution in the provided sources.
Technical view
The vulnerability is a CWE-125 out-of-bounds read in Huawei’s idap module affecting HarmonyOS 2.0. CVSS 3.1 is 7.5 with AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating unauthenticated network reachability and availability-only impact.
Likely exposure
Organizations with Huawei HarmonyOS 2.0 deployments are the relevant exposure. The source bundle does not identify specific device models, deployment roles, or reachable interfaces, so asset confirmation is required before estimating business impact.
Exploitation context
The bundle and KEV status do not support active exploitation. The CVSS vector indicates low-complexity remote triggering, with impact limited to availability. No exploit mechanics, proof of concept, or affected model list is provided.
Researcher notes
Public detail is sparse. The evidence supports an out-of-bounds read causing denial of service, not confidentiality impact, integrity impact, or remote code execution. Do not infer affected models beyond HarmonyOS 2.0.
Mitigation direction
- Review Huawei’s November 2021 HarmonyOS security bulletin for vendor-designated fixed builds.
- Prioritize updates for confirmed HarmonyOS 2.0 assets.
- Check Huawei support guidance if a device cannot be updated.
- Reduce unnecessary network exposure for affected HarmonyOS devices where operationally possible.
Validation and detection
- Inventory Huawei devices and confirm whether they run HarmonyOS 2.0.
- Compare device patch levels against Huawei’s November 2021 security bulletin.
- Confirm whether the idap module or related network surface is present and reachable.
- Monitor affected assets for unexpected crashes or availability degradation.
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-2021-39984 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: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.
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.