CVE-2025-21259
Microsoft Outlook Spoofing Vulnerability
MEDIUM
5.3
CVSS Score
Published: February 11, 2025 at 05:58 PM UTC
Updated: June 17, 2026 at 08:42 AM UTC
2 products affected across 1 vendorOutlookOutlook 2016
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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%
SSVC
No known exploit
Description
Microsoft Outlook Spoofing Vulnerability
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Affected range stops below 4.2501.1, so it looks safe — our inference, not a vendor statement
1.0 ≤ v < 4.2501.1
Affected range stops below 4.2501.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (1)
Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21259SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
5.3MEDIUMmicrosoft
Vector?
Quick Info
StatusANALYZED
CWE
CWE-451NVD-CWE-noinfo
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