Security readout for executives and security teams
Plain-English summary
Microsoft Dynamics 365 Customer Service contains an input-validation flaw that could let an unauthenticated remote attacker expose sensitive information. The supplied CVSS score is 8.1, reflecting potentially serious confidentiality, integrity, and availability consequences, although exploitation requires high complexity.
Executive priority
Treat as a high-priority verification and remediation item. Quickly establish whether Dynamics 365 Customer Service is deployed, confirm Microsoft update compliance, and reduce unnecessary exposure. Escalate systems handling sensitive customer information or reachable from untrusted networks.
Technical view
CVE-2025-30391 is a CWE-20 improper input validation vulnerability reachable over a network without privileges or user interaction. The supplied vector indicates high attack complexity and high potential impact across confidentiality, integrity, and availability. The source bundle does not identify affected build ranges or disclose technical attack details.
Likely exposure
Organizations using Dynamics 365 Customer Service may be exposed, particularly where affected services are network-accessible. Exact vulnerable versions, configurations, and deployment models are not specified in the supplied evidence, so exposure requires comparison with Microsoft's advisory and organizational asset records.
Exploitation context
The CVE is not listed in the supplied KEV data, and no cited source establishes active exploitation. This does not prove exploitation is absent. Remote, unauthenticated access increases concern, while high attack complexity may reduce practical exploitability.
Researcher notes
Public evidence identifies improper input validation but provides no vulnerable version range, affected component, indicators, or confirmed exploitation. The 8.1 vector specifies network access, no privileges, no interaction, high complexity, and high impacts. Avoid inferring exploit mechanics from the broad CWE classification.
Mitigation direction
- Review Microsoft's CVE advisory for affected builds and deployment-specific remediation.
- Apply the Microsoft-provided patch or update identified for applicable Dynamics 365 Customer Service deployments.
- Restrict unnecessary network access while remediation status remains uncertain.
- Follow subsequent Microsoft guidance if affected-version details or mitigations change.
Validation and detection
- Inventory all Dynamics 365 Customer Service deployments and responsible owners.
- Compare deployed build and update status against Microsoft's advisory.
- Confirm the applicable Microsoft remediation completed successfully across identified deployments.
- Review relevant service and access logs for unexplained unauthenticated activity.
- Reassess externally reachable services after remediation.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2025-30391 mapping review
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Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.25.9microsoftVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft Dynamics Information Disclosure VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.