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Vulnerability record · CVE-2018-0833 · published 15 February 2018

CVE-2018-0833: Microsoft windows 8.1 null pointer dereference vulnerability

Microsoft · Windows 8.1

The Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client in Windows 8.1 and RT 8.1 and Windows Server 2012 R2 allows a denial of service vulnerability due to how specially crafted requests are handled, aka "SMBv2/SMBv3 Null Dereference Denial of Service Vulnerability".

5.3 CVSS 3.0 Medium EPSS 40% · top 1.4% CWE-476 · NULL pointer dereference
5.3CVSS 3.0 base score, v2 6.3
40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
10References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

The Microsoft Server Message Block 2.0 and 3.0 (SMBv2/SMBv3) client in Windows 8.1 and RT 8.1 and Windows Server 2012 R2 allows a denial of service vulnerability due to how specially crafted requests are handled, aka "SMBv2/SMBv3 Null Dereference Denial of Service Vulnerability".

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/102924 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040375 Third Party AdvisoryVDB Entry
https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833 ExploitThird Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0833 PatchVendor Advisory
https://www.exploit-db.com/exploits/44189/ ExploitThird Party AdvisoryVDB Entry
http://www.securityfocus.com/bid/102924 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1040375 Third Party AdvisoryVDB Entry
https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833 ExploitThird Party Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0833 PatchVendor Advisory
https://www.exploit-db.com/exploits/44189/ ExploitThird Party AdvisoryVDB Entry

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-0833), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.