Exploitation evidence
Known exploited · CISA KEV listed
Added 2025-02-11. Ransomware campaign use: Unknown.
CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA due date: 2025-03-04. This is the catalog’s deadline, not an assessment of your organization’s exposure.
KEV checked 13 Nov 2026, 00:20 Jerusalem · Original catalog ↗Reported products and versions
Microsoft / Windows 10 Version 1507
Default status: Not specified
- affected: 10.0.10240.0 to < 10.0.10240.20915 (custom)
Microsoft / Windows 10 Version 1607
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.7785 (custom)
Microsoft / Windows 10 Version 1809
Default status: Not specified
- affected: 10.0.17763.0 to < 10.0.17763.6893 (custom)
Microsoft / Windows 10 Version 21H2
Default status: Not specified
- affected: 10.0.19044.0 to < 10.0.19044.5487 (custom)
Microsoft / Windows 10 Version 22H2
Default status: Not specified
- affected: 10.0.19045.0 to < 10.0.19045.5487 (custom)
Microsoft / Windows 11 version 22H2
Default status: Not specified
- affected: 10.0.22621.0 to < 10.0.22621.4890 (custom)
Microsoft / Windows 11 version 22H3
Default status: Not specified
- affected: 10.0.22631.0 to < 10.0.22631.4890 (custom)
Microsoft / Windows 11 Version 23H2
Default status: Not specified
- affected: 10.0.22631.0 to < 10.0.22631.4890 (custom)
Microsoft / Windows 11 Version 24H2
Default status: Not specified
- affected: 10.0.26100.0 to < 10.0.26100.3194 (custom)
Microsoft / Windows Server 2008 R2 Service Pack 1
Default status: Not specified
- affected: 6.1.7601.0 to < 6.1.7601.27566 (custom)
Microsoft / Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Default status: Not specified
- affected: 6.1.7601.0 to < 6.1.7601.27566 (custom)
Microsoft / Windows Server 2008 Service Pack 2
Default status: Not specified
- affected: 6.0.6003.0 to < 6.0.6003.23117 (custom)
Microsoft / Windows Server 2008 Service Pack 2 (Server Core installation)
Default status: Not specified
- affected: 6.0.6003.0 to < 6.0.6003.23117 (custom)
Microsoft / Windows Server 2012
Default status: Not specified
- affected: 6.2.9200.0 to < 6.2.9200.25317 (custom)
Microsoft / Windows Server 2012 (Server Core installation)
Default status: Not specified
- affected: 6.2.9200.0 to < 6.2.9200.25317 (custom)
Microsoft / Windows Server 2012 R2
Default status: Not specified
- affected: 6.3.9600.0 to < 6.3.9600.22417 (custom)
Microsoft / Windows Server 2012 R2 (Server Core installation)
Default status: Not specified
- affected: 6.3.9600.0 to < 6.3.9600.22417 (custom)
Microsoft / Windows Server 2016
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.7785 (custom)
Microsoft / Windows Server 2016 (Server Core installation)
Default status: Not specified
- affected: 10.0.14393.0 to < 10.0.14393.7785 (custom)
Microsoft / Windows Server 2019
Default status: Not specified
- affected: 10.0.17763.0 to < 10.0.17763.6893 (custom)
Microsoft / Windows Server 2019 (Server Core installation)
Default status: Not specified
- affected: 10.0.17763.0 to < 10.0.17763.6893 (custom)
Microsoft / Windows Server 2022
Default status: Not specified
- affected: 10.0.20348.0 to < 10.0.20348.3207 (custom)
Microsoft / Windows Server 2022, 23H2 Edition (Server Core installation)
Default status: Not specified
- affected: 10.0.25398.0 to < 10.0.25398.1425 (custom)
Microsoft / Windows Server 2025
Default status: Not specified
- affected: 10.0.26100.0 to < 10.0.26100.3194 (custom)
Microsoft / Windows Server 2025 (Server Core installation)
Default status: Not specified
- affected: 10.0.26100.0 to < 10.0.26100.3194 (custom)
Fixes and workarounds
No explicit solution text in the downloaded CVE record. Consult the vendor advisory; unaffected version ranges are shown above as reported, not inferred as a patch recommendation.
Sources and related reporting
Observed change timeline
History begins when Egret first downloads each source. It is not the complete upstream CVE history.
12 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-12",
"epss": 0.02132,
"percentile": 0.8224
}10 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-10",
"epss": 0.02132,
"percentile": 0.82127
}09 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-09",
"epss": 0.02132,
"percentile": 0.82107
}08 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-08",
"epss": 0.02132,
"percentile": 0.82098
}07 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-07",
"epss": 0.02132,
"percentile": 0.82083
}06 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-06",
"epss": 0.02132,
"percentile": 0.82052
}06 Nov 2026, 06:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-05",
"epss": 0.02132,
"percentile": 0.82041
}04 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-04",
"epss": 0.02132,
"percentile": 0.82029
}04 Nov 2026, 00:20 Jerusalem · CVE Program record changed
Stored CNA snapshot at this observation.
{
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"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}03 Nov 2026, 18:20 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-03",
"epss": 0.02132,
"percentile": 0.81997
}03 Nov 2026, 02:22 Jerusalem · EPSS observation updated
Stored EPSS snapshot at this observation.
{
"date": "2026-11-02",
"epss": 0.02132,
"percentile": 0.81976
}03 Nov 2026, 02:22 Jerusalem · CISA KEV status changed
Stored KEV snapshot at this observation.
{
"cveID": "CVE-2025-21418",
"cwes": [
"CWE-122"
],
"dateAdded": "2025-02-11",
"dueDate": "2025-03-04",
"forensicTriage": "No",
"knownRansomwareCampaignUse": "Unknown",
"notes": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418 ; https://nvd.nist.gov/vuln/detail/CVE-2025-21418",
"product": "Windows",
"requiredAction": "Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.",
"shortDescription": "Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.",
"vendorProject": "Microsoft",
"vulnerabilityName": "Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability"
}