CVE-2025-21259

Name: CVE-2025-21259
Creator: NVD / NIST
Published: 2025-02-11T18:15:32.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2025-21259 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Microsoft Outlook Spoofing Vulnerability. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

Microsoft Outlook Spoofing Vulnerability

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.06%

60.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-451

Affected Software

Vendor	Product	Versions
Microsoft	Outlook	< 4.2501.1

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21259Patch, Vendor Advisory

Timeline

Published: Feb 11, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21259?

Microsoft Outlook Spoofing Vulnerability

How severe is CVE-2025-21259?

CVE-2025-21259 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2025-21259?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21259?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST