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CVE-2025-21307

Microsoft Windows 10 1507 remote code execution

9.8 CRITICALEPSS 1.91%
  1. Published14 Jan 2025

Description

Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Microsoft Windows 10 1507< 10.0.10240.20890
Microsoft Windows 10 1607< 10.0.14393.7699
Microsoft Windows 10 1809< 10.0.17763.6775
Microsoft Windows 10 21h2< 10.0.19044.5371
Microsoft Windows 10 22h2< 10.0.19045.5371
Microsoft Windows 11 22h2< 10.0.22621.4751
Microsoft Windows 11 23h2< 10.0.22631.4751
Microsoft Windows 11 24h2< 10.0.26100.2894
Microsoft Windows Server 2008r2
Microsoft Windows Server 2012r2
Microsoft Windows Server 2016< 10.0.14393.7699
Microsoft Windows Server 2019< 10.0.17763.6775
Microsoft Windows Server 2022< 10.0.20348.3091
Microsoft Windows Server 2022 23h2< 10.0.25398.1369
Microsoft Windows Server 2025< 10.0.26100.2894

Remediation

Fixed in
Microsoft Windows 10 1507≥ 10.0.10240.20890
Microsoft Windows 10 1607≥ 10.0.14393.7699
Microsoft Windows 10 1809≥ 10.0.17763.6775
Microsoft Windows 10 21h2≥ 10.0.19044.5371
Microsoft Windows 10 22h2≥ 10.0.19045.5371
Microsoft Windows 11 22h2≥ 10.0.22621.4751
Microsoft Windows 11 23h2≥ 10.0.22631.4751
Microsoft Windows 11 24h2≥ 10.0.26100.2894
Microsoft Windows Server 2016≥ 10.0.14393.7699
Microsoft Windows Server 2019≥ 10.0.17763.6775

Frequently asked

Is CVE-2025-21307 being actively exploited?

CVE-2025-21307 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.91%.

How severe is CVE-2025-21307?

CVE-2025-21307 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.91% probability of exploitation.

Which products are affected by CVE-2025-21307?

Affected products include Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, and 10 more.

How do I fix CVE-2025-21307?

Upgrade affected software to a fixed version, for example Microsoft Windows 10 1507 10.0.10240.20890, Microsoft Windows 10 1607 10.0.14393.7699, Microsoft Windows 10 1809 10.0.17763.6775 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-21307 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.