Exploited vulnerability · CISA KEV
Yes. CVE-2025-30397, Microsoft Windows Scripting Engine Type Confusion Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 13 May 2025, the day it was published. It affects Microsoft Windows. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Microsoft Windows Scripting Engine contains a type confusion vulnerability that allows an unauthorized attacker to execute code over a network via a specially crafted URL.
| Vendor | Microsoft (391 exploited CVEs in KEV) |
| Product | Windows |
| Vulnerability | Microsoft Windows Scripting Engine Type Confusion Vulnerability |
| Weakness | CWE-843 |
| Published | 13 May 2025 |
| Added to KEV | 13 May 2025 |
| Reported by (CNA) | microsoft |
Yes. CISA added CVE-2025-30397 to the Known Exploited Vulnerabilities catalog on 13 May 2025, which means there is reliable evidence of exploitation in the wild.
CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Microsoft's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Windows and watch it for signs of compromise.
Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in May 2025 · Microsoft scorecard · act-now radar.
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