CVE-2024-21378
Published: 13 February 2024
Summary
CVE-2024-21378 is a high-severity Code Injection (CWE-94) vulnerability in Microsoft 365 Apps. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 3.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Microsoft Outlook contains a remote code execution vulnerability tracked as CVE-2024-21378 and assigned CWE-94. The flaw carries a CVSS 3.1 score of 8.8 reflecting network attack vector, low complexity, low required privileges, and no user interaction, enabling an attacker to achieve full confidentiality, integrity, and availability impact on affected Outlook installations.
An authenticated attacker with network access can send specially crafted messages or content that trigger code execution on the target system, resulting in complete compromise of the Outlook process and potentially the underlying host.
Microsoft has published an advisory for CVE-2024-21378 in its security update guide at the referenced URL. The current EPSS score of 0.2731 matches its recorded peak and does not indicate a post-disclosure rise in observed exploitation interest.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2024-19090
Vulnerability details
Microsoft Outlook Remote Code Execution Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Makes persistent code injection into loaded programs impossible when the executable image itself resides on hardware-protected read-only media.
Dynamically generated code can be produced and executed inside the isolated chamber, preventing host compromise from code-injection payloads.
Validates inputs used in dynamic code generation to block injected directives.
Directly prevents execution of attacker-supplied code written into data memory regions.