CISA KEV · Known exploitedCritical

CVE-2024-21413

Microsoft Office Outlook

CVE-2024-21413 affects Microsoft Office Outlook. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

CVSS
9.8
EPSS
94.7%
99.8% percentile
CISA KEV
Listed
Published
2024.02.14
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability94.7%
Technical severityCVSS 9.8

Vulnerability overview

CVE-2024-21413 affects Microsoft Office Outlook. Review the CVSS score, exploitation signals, affected versions, remediation status, and linked source material before making a change.

Affected product and versions

Product
Microsoft Office Outlook
Affected versions
19.0.0, 16.0.1, 16.0.0, 2021
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2025.02.27
  1. 1
    Identify

    Confirm that Microsoft Office Outlook and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-20
KEV added
2025.02.06
Ransomware use
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