Security readout for executives and security teams
Plain-English summary
A flaw in Microsoft’s Windows USB Generic Parent Driver could let an attacker execute code after obtaining physical access to an affected computer. Successful exploitation could compromise confidentiality, integrity, and availability, but Microsoft rates the attack as complex. The supplied evidence does not show active exploitation.
Executive priority
Treat this as a normal-to-elevated patching priority, not an internet-wide emergency. Accelerate remediation for systems exposed to visitors, contractors, shared spaces, or uncontrolled USB devices. Potential compromise impact is high, although physical access and difficult exploitation reduce likelihood.
Technical view
CVE-2024-21339 is a use-after-free vulnerability (CWE-416) in the Windows USB Generic Parent Driver. Its CVSS 3.1 score is 6.4, with physical access and high attack complexity required, no privileges or user interaction, unchanged scope, and potentially high confidentiality, integrity, and availability impact.
Likely exposure
Exposure applies to the listed Windows 10, Windows 11, Windows Server 2019, and Windows Server 2022 releases. Systems accessible to untrusted people or allowing uncontrolled USB devices warrant particular attention. The source bundle does not establish whether later builds or other Windows editions are affected.
Exploitation context
The CVSS vector requires physical access and high attack complexity. No privileges or user interaction are required once the attack conditions exist. The CVE is not listed as KEV in the supplied bundle, and its CVSS exploit-maturity metric is unproven; therefore, active exploitation is not established.
Researcher notes
The supplied record identifies CWE-416 but provides no detailed vulnerable code path, trigger conditions, proof of concept, or observed attacks. Validation should focus on product/build applicability and update state. Avoid inferring remote network exploitability from the title: the CVSS vector explicitly specifies physical access.
Mitigation direction
- Apply the applicable Microsoft security update after standard testing.
- Prioritize publicly accessible, shared, kiosk, and other physically exposed Windows systems.
- Restrict unauthorized physical and USB device access where operationally appropriate.
- Consult Microsoft’s advisory for release-specific update and mitigation guidance.
Validation and detection
- Inventory affected Windows editions, versions, and build numbers against Microsoft’s advisory.
- Verify the applicable Microsoft security update is installed successfully.
- Confirm endpoint management reports no remaining vulnerable systems.
- Review controls governing physical access and unauthorized USB devices.
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-416: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2024-21339 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
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
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.
SSVC decision data
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:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C0.55.9microsoftVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows USB Generic Parent Driver Remote Code Execution VulnerabilityCVE reference, microsoft · vendor-advisory, patch
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.