Security readout for executives and security teams
Plain-English summary
Microsoft’s On-Premises Data Gateway has a medium-severity information disclosure vulnerability. The source bundle indicates a low-privileged attacker would need user interaction and difficult conditions, but successful exploitation could expose sensitive information and affect integrity. No active exploitation is cited here.
Executive priority
Treat this as a scheduled but timely remediation item. It is not marked as exploited here, but the potential confidentiality and integrity impacts justify prompt inventory and patch validation.
Technical view
CVE-2025-21403 is listed as a CWE-863 issue in Microsoft On-Premises Data Gateway. CVSS 3.1 is 6.4 with network attack vector, high complexity, low privileges, user interaction required, high confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is most likely for organizations running Microsoft On-Premises Data Gateway. The bundle lists version 1.0.0, but teams should verify exact affected builds against Microsoft’s advisory.
Exploitation context
The provided data does not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates exploitation is not trivial because it requires high complexity, low privileges, and user interaction.
Researcher notes
Source detail is limited. The key signals are Microsoft vendor advisory, CWE-863, CVSS 6.4, user interaction required, and high confidentiality and integrity impact. Avoid assuming exploitability beyond the published vector.
Mitigation direction
- Review the Microsoft MSRC advisory for supported updates and affected build details.
- Update affected On-Premises Data Gateway installations according to Microsoft guidance.
- Inventory all gateway deployments, including non-production and legacy hosts.
- Limit gateway access paths to required users, services, and networks where feasible.
- Monitor Microsoft advisory updates for revised affected versions or mitigation guidance.
Validation and detection
- Confirm whether On-Premises Data Gateway is deployed in the environment.
- Compare installed gateway versions and builds against the MSRC advisory.
- Verify update records show remediation on every identified gateway host.
- Review access controls for unnecessary users or network exposure.
- Check security monitoring for suspicious gateway-related authentication or access events.
Public sources used
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-863: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2025-21403 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/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:L/UI:R/S:U/C:H/I:H/A:N/E:U/RC:C1.25.2microsoftVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/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
- On-Premises Data Gateway 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.
Incorrect Authorization
Incorrect Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.