CVE-2018-8493
Status: ModifiedHigh (7.5)—
An information disclosure vulnerability exists when the Windows TCP/IP stack improperly handles fragmented IP packets, aka "Windows TCP/IP Information Disclosure Vulnerability." This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers.
CVSS
- Version: 3.1
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Base score: 7.5
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days: 8.42%
- Percentile among all scored CVEs: 95
- Score date: 10/6/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (10)
CWEs
- NVD-CWE-noinfo
References
- http://www.securityfocus.com/bid/105456
- http://www.securitytracker.com/id/1041843
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8493
- http://www.securityfocus.com/bid/105456
- http://www.securitytracker.com/id/1041843
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8493
Raw JSON (NVD)
Show
{
"id": "CVE-2018-8493",
"cveTags": [],
"metrics": {
"cvssMetricV2": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"version": "2.0",
"baseScore": 5,
"accessVector": "NETWORK",
"vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
"authentication": "NONE",
"integrityImpact": "NONE",
"accessComplexity": "LOW",
"availabilityImpact": "NONE",
"confidentialityImpact": "PARTIAL"
},
"acInsufInfo": false,
"impactScore": 2.9,
"baseSeverity": "MEDIUM",
"obtainAllPrivilege": false,
"exploitabilityScore": 10,
"obtainUserPrivilege": false,
"obtainOtherPrivilege": false,
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"cvssData": {
"scope": "UNCHANGED",
"version": "3.1",
"baseScore": 7.5,
"attackVector": "NETWORK",
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
"availabilityImpact": "NONE",
"privilegesRequired": "NONE",
"confidentialityImpact": "HIGH"
},
"impactScore": 3.6,
"exploitabilityScore": 3.9
}
]
},
"affected": [
{
"source": "secure@microsoft.com",
"affectedData": [
{
"vendor": "Microsoft",
"product": "Windows Server 2012 R2",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows RT 8.1",
"versions": [
{
"status": "affected",
"version": "Windows RT 8.1"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows Server 2016",
"versions": [
{
"status": "affected",
"version": "(Server Core installation)"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows 8.1",
"versions": [
{
"status": "affected",
"version": "32-bit systems"
},
{
"status": "affected",
"version": "x64-based systems"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows 10",
"versions": [
{
"status": "affected",
"version": "32-bit Systems"
},
{
"status": "affected",
"version": "Version 1607 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1607 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1703 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1703 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1709 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1709 for x64-based Systems"
},
{
"status": "affected",
"version": "Version 1803 for 32-bit Systems"
},
{
"status": "affected",
"version": "Version 1803 for x64-based Systems"
},
{
"status": "affected",
"version": "x64-based Systems"
}
]
},
{
"vendor": "Microsoft",
"product": "Windows 10 Servers",
"versions": [
{
"status": "affected",
"version": "version 1709 (Server Core Installation)"
},
{
"status": "affected",
"version": "version 1803 (Server Core Installation)"
}
]
}
]
}
],
"published": "2018-10-10T13:29:04.073",
"references": [
{
"url": "http://www.securityfocus.com/bid/105456",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"source": "secure@microsoft.com"
},
{
"url": "http://www.securitytracker.com/id/1041843",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"source": "secure@microsoft.com"
},
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8493",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "secure@microsoft.com"
},
{
"url": "http://www.securityfocus.com/bid/105456",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "http://www.securitytracker.com/id/1041843",
"tags": [
"Third Party Advisory",
"VDB Entry"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
},
{
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8493",
"tags": [
"Patch",
"Vendor Advisory"
],
"source": "af854a3a-2127-422b-91ae-364da2661108"
}
],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "An information disclosure vulnerability exists when the Windows TCP/IP stack improperly handles fragmented IP packets, aka \"Windows TCP/IP Information Disclosure Vulnerability.\" This affects Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers."
},
{
"lang": "es",
"value": "Existe una vulnerabilidad de divulgación de información cuando la pila TCP/IP de Windows gestiona incorrectamente los paquetes IP fragmentados. Esto también se conoce como \"Windows TCP/IP Information Disclosure Vulnerability\". Esto afecta a Windows Server 2012 R2, Windows RT 8.1, Windows Server 2016, Windows 8.1, Windows 10 y Windows 10 Servers."
}
],
"lastModified": "2026-06-17T02:04:59.513",
"configurations": [
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "542DAEEC-73CC-46C6-A630-BF474A3446AC"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "61019899-D7AF-46E4-A72C-D189180F66AB"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1703:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "E1DD582C-1660-4E6E-81A1-537BD1307A99"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "AC160B20-3EA0-49A0-A857-4E7A1C2D74E2"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "00345596-E9E0-4096-8DC6-0212F4747A13"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x64:*",
"vulnerable": true,
"matchCriteriaId": "C936FD4F-959C-43B8-9917-E2A0DF4A8793"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x86:*",
"vulnerable": true,
"matchCriteriaId": "DF8ABB14-84CF-4BBC-99C9-DA6C0F7A0619"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:rt:*:*:*",
"vulnerable": true,
"matchCriteriaId": "D01999BB-2CD6-4C84-A518-3A3BB78F1105"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_1709:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "53695559-6E95-43C1-AD7C-1D99473223C2"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_1803:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "37097C39-D588-4018-B94D-5EB87B1E3D5A"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E"
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "041FF8BA-0B12-4A1F-B4BF-9C4F33B7C1E7"
}
],
"operator": "OR"
}
]
}
],
"sourceIdentifier": "secure@microsoft.com"
}