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Vulnerabilities/CVE-2025-64667Public Intelligence Dossier
Source: microsoft · Limited verification•Last verified: •Collection Running
CVE-2025-64667Unknown / EvaluatingMEDIUM (raw)CVSS 5.3CWE-451

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

Published: 09 Dec 2025•Last updated: 15 Oct 2026, 02:40 AM IST•Source identifier: secure@microsoft.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
5.3MEDIUM (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Metric sourcesecure@microsoft.com
EPSS probability
0.8%0.008
Percentile56th
Weakness type
CWE-451
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

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

SOC priority

Medium

Actively exploited

Unknown

Publicly disclosed

Unknown

Risk basis: Microsoft or Microsoft-managed product relevance; No confirmed exploitation signal in current enrichment

Affected Products & Remediation

2 source-backed products
Affected products and versions (source)
  • microsoft exchange server · 2016; 2019; subscription edition < 15.02.2562.035 · NVD CPE · Source
  • microsoft exchange server subscription edition · < 15.02.2562.035 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched microsoft-enterprise (Affected product: microsoft exchange server, Vendor: microsoft); network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify affected Microsoft products and compare local builds with the MSRC advisory.Telemetry: DeviceTvmSoftwareVulnerabilities · The MSRC product/build mapping establishes applicability. · Rule microsoft-enterprise
  2. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review the advisory's documented behavior on matching hosts before selecting a hunt.Telemetry: DeviceProcessEvents · Product family alone does not justify a CVE-specific detection. · Rule microsoft-enterprise
Show more (2)

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated KB or mitigation on matching assets.Telemetry: DeviceTvmSoftwareVulnerabilities · A post-update inventory check verifies remediation. · Rule microsoft-enterprise

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
secure@microsoft.com
Record status · verification
UPDATED · Microsoft primary source linked
CPE
cpe:2.3:a:microsoft:exchange_server:2016:-:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_1:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_10:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_11:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_12:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_13:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_14:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_15:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_16:*:*:*:*:*:*, cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_17:*:*:*:*:*:*

Evidence & Provenance

2 public sources
msrc.microsoft.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2025-64667
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2025-64667
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2025-64667"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

Correlated briefings

— No published briefing references this CVE

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.