Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated network attacker disrupt Microsoft Message Queuing on affected Windows systems. The business impact is service interruption, not data theft, based on the published CVSS impact. Prioritize systems where MSMQ supports business workflows or is reachable from untrusted networks.
Executive priority
High priority for environments using MSMQ in production, especially on servers supporting transaction, messaging, or application workflows. The expected harm is outage or degradation rather than data compromise. Patch and exposure reduction should be scheduled promptly within normal high-severity remediation timelines.
Technical view
CVE-2025-21290 is a Microsoft Message Queuing denial-of-service issue rated CVSS 7.5. The vector is network-accessible, low complexity, no privileges, and no user interaction. It maps to CWE-400, indicating uncontrolled resource consumption. Published impact is availability only; confidentiality and integrity impacts are not indicated.
Likely exposure
Exposure is most relevant to affected Windows client and server versions running or relying on Microsoft Message Queuing. Risk increases where MSMQ is reachable over a network, especially from less trusted segments. The provided sources do not confirm whether MSMQ must be enabled by default.
Exploitation context
The source bundle does not indicate active exploitation, and CISA KEV status is false. The CVSS exploit maturity value is unproven. Treat this as a credible denial-of-service risk because it is unauthenticated and network-accessible, but do not assume known in-the-wild exploitation from the provided evidence.
Researcher notes
Evidence is limited to the CVE record, Microsoft advisory, CVSS, CWE, affected product list, and KEV=false status. No exploit details, proof-of-concept, or in-the-wild exploitation are provided. Avoid assuming affected configurations beyond Microsoft’s listed Windows versions and MSMQ context.
Mitigation direction
- Apply Microsoft’s official update or guidance for CVE-2025-21290.
- Prioritize internet-facing or cross-segment systems using MSMQ.
- Limit MSMQ network reachability to required trusted systems.
- Review business applications that depend on MSMQ availability.
- Monitor vendor guidance for any revised mitigations or affected versions.
Validation and detection
- Inventory Windows systems listed as affected by Microsoft.
- Identify systems where MSMQ is installed, enabled, or business-critical.
- Check patch compliance against Microsoft’s CVE-2025-21290 advisory.
- Confirm MSMQ is not reachable from unnecessary network segments.
- Review monitoring for MSMQ availability or resource-exhaustion symptoms.
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-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-2025-21290 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
- Microsoft Message Queuing (MSMQ) 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.