CVE-2025-21307: microsoft windows_10_1507 Use After Free
CVSS: 9.8v3.1CriticalAnalyzed
Published 14-01-2025Last modified 09-06-2026
Vulnerability summary
CVE-2025-21307 is a critical (CVSS 9.8) Use After Free vulnerability in microsoft windows_10_1507. EPSS estimates a 1.94% chance of exploitation in the next 30 days, higher than 79.9% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
1.94%
0%100%
Low · +0.03 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 14-01-2025PublishedVulnerability first disclosed.
- 09-06-2026Last modifiedVulnerability information updated.
Description
Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.94%
Chance of exploitation in the next 30 days
Percentile
80%
Versus all other CVEs
30-day change
+0.03 pp
From 1.91% on 21-09-2026
21-09-202621-10-2026
EPSS score1.94%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft35 products
- windows_10_1507< 10.0.10240.20890
- windows_10_1607< 10.0.14393.7699
- windows_10_1809< 10.0.17763.6775
- windows_10_21h2< 10.0.19044.5371
- windows_10_22h2< 10.0.19045.5371
1 vendor · 35 products
