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CVE-2025-64667

Microsoft Exchange Server Spoofing Vulnerability

MEDIUM
5.3
CVSS Score
Published: December 9, 2025 at 05:55 PM UTC
Updated: October 14, 2026 at 09:10 PM UTC
2 products affected across 1 vendorExchange ServerExchange Server Subscription Edition

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.8%
SSVC
No known exploit

Description

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Exchange Server· Microsoft
95%
15.01.0.015.02.0.020162016 cumulative_update_12016 cumulative_update_102016 cumulative_update_112016 cumulative_update_122016 cumulative_update_132016 cumulative_update_142016 cumulative_update_152016 cumulative_update_162016 cumulative_update_172016 cumulative_update_182016 cumulative_update_192016 cumulative_update_22016 cumulative_update_202016 cumulative_update_212016 cumulative_update_222016 cumulative_update_32016 cumulative_update_42016 cumulative_update_52016 cumulative_update_62016 cumulative_update_72016 cumulative_update_82016 cumulative_update_920192019 cumulative_update_12019 cumulative_update_102019 cumulative_update_112019 cumulative_update_122019 cumulative_update_132019 cumulative_update_22019 cumulative_update_32019 cumulative_update_42019 cumulative_update_52019 cumulative_update_62019 cumulative_update_72019 cumulative_update_82019 cumulative_update_9
Affected range stops below 15.01.2507.063, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1544.037, so it looks safe — our inference, not a vendor statement
Affected range stops below 15.02.1748.042, so it looks safe — our inference, not a vendor statement
Exchange Server Subscription Edition· Microsoft
95%
v < 15.02.2562.03515.02.0.0
Affected range stops below 15.02.2562.035, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: cverecord
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64667

SSVC — 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-451

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