Security readout for executives and security teams
Plain-English summary
This Windows flaw lets a logged-in local attacker move from limited access to higher privileges. It affects many supported Windows desktop and server versions. Because CISA lists it as known exploited, this should be treated as a real-world patching priority, not a theoretical issue.
Executive priority
Treat this as a high-priority Windows patching item because exploitation is confirmed by CISA. It is not usually an initial entry bug, but it can turn a limited compromise into deeper control of endpoints or servers.
Technical view
CVE-2025-30400 is a use-after-free flaw in Microsoft Windows DWM Core Library, tracked as CWE-416. Microsoft rates it CVSS 7.8: local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely wherever affected Windows 10, Windows 11, Windows Server 2019, Server 2022, or Server 2025 systems have not received Microsoft’s update for this CVE.
Exploitation context
CISA KEV status supports active exploitation. The provided sources do not identify campaigns, targets, or exploit mechanics. Since this is local privilege escalation, it is most concerning when an attacker already has user-level access on a Windows host.
Researcher notes
The source bundle confirms affected products, CWE-416, CVSS 7.8, Microsoft advisory coverage, and CISA KEV status. It does not provide root-cause detail, proof-of-concept information, exploit telemetry, or non-patch mitigations.
Mitigation direction
- Apply Microsoft security updates for CVE-2025-30400 across affected Windows systems.
- Prioritize internet-exposed, user workstation, VDI, and administrator-access Windows assets.
- Follow Microsoft guidance if standard patching is delayed or constrained.
- Use CISA KEV deadlines to drive remediation urgency where applicable.
Validation and detection
- Inventory Windows builds listed as affected by Microsoft for this CVE.
- Confirm security update installation status through endpoint management or vulnerability tooling.
- Verify high-risk Windows servers and workstations are included in patch compliance reports.
- Check CISA KEV tracking for operational deadlines and exploitation context.
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-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-30400 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/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.
CISA KEV status
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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Microsoft DWM Core Library Elevation of Privilege VulnerabilityCVE reference · vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-30400CVE reference · government-resource
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.