Security readout for executives and security teams
Plain-English summary
A remote, unauthenticated attacker can consume excessive resources in Windows LDAP and make the service unavailable. Successful attacks affect availability rather than data confidentiality or integrity. Directory-dependent authentication, administration, and applications may be disrupted on affected Windows systems.
Executive priority
Treat as a high-priority availability risk, especially for directory infrastructure supporting authentication and business-critical applications. Accelerate patch validation and deployment on remotely reachable LDAP systems. The sources do not support declaring an active incident or emergency exploitation campaign.
Technical view
CVE-2025-26673 is a CWE-400 uncontrolled resource-consumption flaw in Windows LDAP. It is remotely reachable, requires low complexity, no privileges, and no user interaction. CVSS 3.1 is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Likely exposure
Potential exposure includes the listed Windows 10, Windows 11, and Windows Server releases when their LDAP functionality is network reachable. The bundle does not establish which listed systems have LDAP enabled, their network accessibility, or whether security updates are installed.
Exploitation context
The supplied record does not identify known active exploitation, and the CVE is not listed as KEV in the bundle. The CVSS temporal vector marks exploit maturity unknown. Nevertheless, unauthenticated network reachability and low attack complexity make exposed LDAP services important to remediate.
Researcher notes
The supplied evidence supports remote unauthenticated denial of service through uncontrolled resource consumption, but provides no protocol-level trigger, indicators, affected-component details, or release-specific update identifiers. Avoid inferring code execution or data compromise. Use Microsoft's advisory for authoritative applicability and remediation details.
Mitigation direction
- Review Microsoft's CVE advisory and apply the applicable security updates for each affected Windows release.
- Prioritize network-reachable LDAP servers and systems supporting authentication or other critical directory-dependent services.
- Restrict LDAP network access to required trusted systems using existing segmentation and access controls.
- Check Microsoft guidance for release-specific prerequisites, extended-support requirements, or additional mitigations.
Validation and detection
- Inventory listed Windows releases and record their exact versions, roles, and update status.
- Identify which inventoried systems expose LDAP and from which network zones they are reachable.
- Verify applicable Microsoft security updates are installed using trusted patch-management or operating-system records.
- Confirm LDAP-dependent services remain available after remediation and review telemetry for unexplained resource exhaustion.
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-400: 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 lookupCVE-2025-26673 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C3.93.6microsoftVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 Lightweight Directory Access Protocol (LDAP) Denial of Service 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.