Security readout for executives and security teams
Plain-English summary
A OneNote vulnerability could let attacker-controlled code run on a user's computer after required user interaction. Successful exploitation could compromise confidentiality, integrity, and availability. The supplied severity is high, with a CVSS 3.1 score of 7.8.
Executive priority
Treat as a high-priority endpoint patching issue. Promptly identify affected Office deployments and confirm Microsoft update coverage, especially on systems handling sensitive information. The supplied sources do not support an emergency response based on active exploitation.
Technical view
CVE-2024-21384 is a remote code execution vulnerability categorized as CWE-416, use-after-free. Its vector indicates low complexity, no prior privileges, required user interaction, local attack access, unchanged scope, and high impacts across confidentiality, integrity, and availability.
Likely exposure
The bundle identifies Microsoft 365 Apps for Enterprise and Microsoft Office LTSC 2021, listing version 16.0.1. Determine exposure by mapping installed OneNote editions and builds against Microsoft's advisory; the supplied evidence does not establish a broader affected-version range.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation. CVSS records exploit maturity as unproven. Exploitation requires user interaction but no prior privileges, which reduces automation potential without removing user-endpoint risk.
Researcher notes
The use-after-free classification suggests a memory-lifecycle error, but the bundle provides no root-cause detail, vulnerable component path, proof of concept, or exploitation telemetry. Safe validation should focus on product/build identification and update state rather than attempting exploitation.
Mitigation direction
- Apply Microsoft's security update for CVE-2024-21384 according to the vendor advisory.
- Prioritize endpoints running the identified Microsoft 365 or Office LTSC products.
- Until updated, reduce opportunities for users to interact with untrusted OneNote content.
- Consult Microsoft guidance for affected and remediated build details.
Validation and detection
- Inventory OneNote installations, product editions, versions, and update levels.
- Compare installed builds with the Microsoft CVE advisory and deployment records.
- Verify the relevant security update installed successfully across managed endpoints.
- Investigate update failures and unmanaged systems containing the identified products.
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-2024-21384 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
- Microsoft Office OneNote 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.