What is CVE-2025-21259?

CVE-2025-21259 is a medium-severity vulnerability in Microsoft Outlook For Android, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.3/10. Published 2025-02-11.

How severe is CVE-2025-21259?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Microsoft Outlook For Android

CVE-2025-21259

Microsoft Outlook Spoofing Vulnerability

Published 2025-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.012 · change: +0.000

Affected products

Microsoft Outlook For Android — versions 1.0
Microsoft Outlook

Weakness classification (CWE)

CWE-451 — User Interface (UI) Misrepresentation of Critical Information

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21259 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21259?: CVE-2025-21259 is a medium-severity vulnerability in Microsoft Outlook For Android, classified under User Interface (UI) Misrepresentation of Critical Information. CVSS score: 5.3/10. Published 2025-02-11.
How severe is CVE-2025-21259?: Medium severity. CVSS v3 base score is 5.3 out of 10.