Security readout for executives and security teams
Plain-English summary
This is a Windows local privilege escalation flaw in Microsoft Brokering File System. An attacker already able to run low-privileged code on an affected system could gain much higher impact over confidentiality, integrity, and availability. Microsoft lists an official fix.
Executive priority
Prioritize remediation in normal high-severity Windows patch cycles, especially for servers or endpoints where low-privileged users can execute code. Urgency increases if affected systems are internet-exposed through other services or used by many untrusted users.
Technical view
CVE-2025-21372 is a CWE-416 use-after-free elevation of privilege issue. The CVSS vector is local, high complexity, low privileges required, no user interaction, scope changed, and high confidentiality, integrity, and availability impact. Affected products are specific Windows 11, Windows Server 2022 23H2 Server Core, and Windows Server 2025 builds.
Likely exposure
Exposure is most likely on unpatched Windows 11 24H2, Windows Server 2022 23H2 Server Core, and Windows Server 2025 systems matching the listed builds.
Exploitation context
The bundle does not support active exploitation. It lists KEV as false and CVSS exploit maturity as unproven. The attack is local and requires low privileges, so it is most relevant after initial access or insider misuse.
Researcher notes
The public bundle identifies the bug class and impact but does not provide root-cause detail, exploit primitives, or compensating controls beyond Microsoft’s patch reference. Treat product/version scoping as limited to the listed affected entries.
Mitigation direction
- Apply Microsoft’s security update for CVE-2025-21372 through normal Windows servicing.
- Prioritize affected Windows 11 24H2 and Windows Server assets.
- Restrict local logon and code execution rights where patching is delayed.
- Monitor Microsoft guidance for supersedence or additional mitigations.
Validation and detection
- Inventory systems matching the affected Microsoft products and versions.
- Confirm installed Windows updates include the CVE-2025-21372 fix.
- Review vulnerability scanner findings against the MSRC advisory.
- Avoid assuming impact on Windows versions not listed in the sources.
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-2025-21372 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
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C1.16microsoftVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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 Brokering File System Elevation of Privilege 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.