What is CVE-2024-21413?
Microsoft Outlook Remote Code Execution Vulnerability
The record classifies CVE-2024-21413 under weakness classes CWE-20, NVD-CWE-noinfo. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 6 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 965 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 92.9% probability of exploitation in the next 30 days, higher than 99.7% of all scored CVEs
- CISA KEV
- Listed since 2025-02-06, federal remediation deadline 2025-02-27
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2024-02-13, last modified 2025-10-28
Is CVE-2024-21413 being exploited?
CISA added CVE-2024-21413 to the Known Exploited Vulnerabilities catalog on 2025-02-06, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-02-27 under BOD 22-01. It currently carries a trending score of 50 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: 365 Apps, Office 2016, Office 2019, Office Long Term Servicing Channel 2021
Showing 4 of 6 recorded product entries.
How to fix CVE-2024-21413
The record marks a vendor fix as available for CVE-2024-21413. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21413. Because CVE-2024-21413 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-02-27. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2024-21413
No threat campaign in the Threadlinqs corpus currently references CVE-2024-21413, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.
Sources
Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.