Security readout for executives and security teams
Plain-English summary
CVE-2025-21187 is a high-severity Microsoft Power Automate for Desktop code execution vulnerability. The available data indicates exploitation requires user interaction and local attack conditions, but successful exploitation could compromise confidentiality, integrity, and availability on affected endpoints.
Executive priority
Treat this as a high-priority endpoint patching issue, especially in environments using desktop automation. It is not evidenced as actively exploited in the provided sources, but impact is high if triggered.
Technical view
Microsoft describes this as a Power Automate for Desktop remote code execution issue affecting version 1.0.0.0. CVSS 3.1 is 7.8 with AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The listed weakness is CWE-94. Microsoft’s advisory is tagged as patch guidance.
Likely exposure
Exposure is most likely on Windows endpoints where Microsoft Power Automate for Desktop version 1.0.0.0 is installed or remains unpatched. The CVSS vector does not describe a network-reachable service exposure.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation. CVSS exploit maturity is unproven. Exploitation requires user interaction, no prior privileges, and low attack complexity under local attack conditions.
Researcher notes
Public detail is limited in the supplied bundle. Do not assume exploitability beyond the CVSS vector. Key missing details include root cause, vulnerable component path, fixed build numbers, and Microsoft’s exact remediation mechanics.
Mitigation direction
- Review Microsoft’s advisory for the official update and deployment guidance.
- Patch affected Power Automate for Desktop installations promptly.
- Prioritize managed workstations where Power Automate is installed.
- Use endpoint management to confirm update coverage.
- Apply normal least-privilege and application-control controls where feasible.
Validation and detection
- Inventory endpoints for Power Automate for Desktop installations.
- Identify systems running version 1.0.0.0 or older affected builds.
- Confirm Microsoft’s update is installed on affected endpoints.
- Check vulnerability management tools for CVE-2025-21187 detections.
- Track exceptions where business systems cannot be patched immediately.
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-94: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-21187 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:N/UI:R/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:N/UI:R/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:N/UI:R/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
- Microsoft Power Automate Remote Code Execution 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.
Improper Control of Generation of Code ('Code Injection')
Improper Control of Generation of Code ('Code Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.