MicrosoftRadarIndependent status for Microsoft services

Microsoft Outlook Remote Code Execution Vulnerability

CVE-2025-21357 is a remote code execution vulnerability in Microsoft Office Outlook (rated Important, CVSS 6.7).

1 version

Facts

Microsoft id
CVE-2025-21357
Products
Microsoft Office Outlook
Severity
Important
Impact
Remote Code Execution
CVSS
6.7
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Customer action required
Yes
Release
2025-Jan
Assigned by
Microsoft
Weakness
CWE-908: Use of Uninitialized Resource
MSRC revision
1.1
Status pages
Outlook status
First captured by us
(from our first import of this list)
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2025-01-14: Information published.
  2. Revision 1.1, 2025-01-27: Added an FAQ to indicate that the Preview Pane is not affected for this CVE. This is an informational change only.

Microsoft says

According to the CVSS metric, the attack complexity is high (AC:H) and privileges required are low (PR:L). What does that mean for this vulnerability?

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Other changes for Outlook