Is CVE-2025-64667 in the CISA KEV catalog?

No. CVE-2025-64667 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-64667?

CVE-2025-64667 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2025-64667?

CVE-2025-64667 has an EPSS score of 0.82% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-64667?

Install KB5071873 for Microsoft Exchange Server 2016 Cumulative Update 23. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2025-64667

MEDIUM

5.3

CVSS v3

NVD

Description

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

CWE-451

How to fix

Remediation Available

Microsoft Exchange Server 2016 Cumulative Update 23Microsoft

Install:KB5071873

Microsoft Exchange Server 2019 Cumulative Update 14Microsoft

Install:KB5071874

Microsoft Exchange Server 2019 Cumulative Update 15Microsoft

Install:KB5071875

Microsoft Exchange Server Subscription Edition RTMMicrosoft

Install:KB5071876Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.82%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Vendor Advisory1

msrc.microsoft.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-15.