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Vulnerability record · CVE-2024-42220 · published 18 December 2024

CVE-2024-42220: Microsoft outlook improper verification of cryptographic signature vulnerability

Microsoft · Outlook

A library injection vulnerability exists in Microsoft Outlook 16.83.3 for macOS. A specially crafted library can leverage Outlook's access privileges, leading to a permission bypass. A malicious application could inject a library and start the program to trigger this vulnerability and then make use of the vulnerable application's permissions.

9.1 CVSS 3.1 Critical EPSS 0.74% · top 47.1% CWE-347 · Improper verification of cryptographic signature
9.1CVSS 3.1 base score
0.74%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 3 tagged exploit
17 Jun 2026Last modified by NVD

Description

A library injection vulnerability exists in Microsoft Outlook 16.83.3 for macOS. A specially crafted library can leverage Outlook's access privileges, leading to a permission bypass. A malicious application could inject a library and start the program to trigger this vulnerability and then make use of the vulnerable application's permissions.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://talosintelligence.com/vulnerability_reports/TALOS-2024-1972 ExploitThird Party Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2024-1972 ExploitThird Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2024-1972 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2024-42220), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.