Security readout for executives and security teams
Plain-English summary
This is a Windows privilege-escalation flaw in Secure Kernel Mode. An attacker already able to run code locally with low privileges could potentially gain higher system control. It is serious for workstations and servers because successful exploitation can affect confidentiality, integrity, and availability.
Executive priority
Prioritize remediation in the next normal high-severity Windows patch cycle, faster for servers or high-value workstations. The main business risk is an intruder turning limited local access into broader control.
Technical view
CVE-2025-21325 is a Microsoft Windows Secure Kernel Mode elevation-of-privilege vulnerability associated with CWE-732. CVSS 3.1 is 7.8: local attack vector, low complexity, low privileges required, no user interaction, unchanged scope, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to listed Windows 10, Windows 11, and Windows Server 2025 builds. The source bundle indicates local access and low privileges are required, so risk is highest where attackers can gain an initial foothold on endpoints or servers.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS exploit code maturity is marked unproven. Treat this as a high-impact post-compromise escalation risk, not as a remotely exploitable entry point based on the available evidence.
Researcher notes
Evidence is limited to the CVE record, CVE List data, and Microsoft advisory. No exploit details should be inferred. Validation should focus on version exposure, patch presence, and whether local low-privilege execution paths exist on affected assets.
Mitigation direction
- Apply the Microsoft update referenced by the MSRC advisory.
- Prioritize affected Windows endpoints and Windows Server 2025 systems.
- Use normal patch management to confirm successful deployment.
- Review Microsoft guidance for any product-specific servicing notes.
- Limit local user and service account exposure where feasible.
Validation and detection
- Inventory systems against the affected Windows versions listed in the advisory.
- Confirm installed Windows build and security update status.
- Check vulnerability scanner results after patch deployment.
- Review endpoint telemetry for unusual local privilege escalation behavior.
- Track MSRC for any advisory revisions or additional guidance.
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-732: 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 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-2025-21325 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:L/PR:L/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C1.85.9microsoftVulnerability 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: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
- Windows Secure Kernel Mode 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.
Incorrect Permission Assignment for Critical Resource
Incorrect Permission Assignment for Critical Resource represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.