Microsoft Windows 8.1/10/Server 2012/Server 2016 SMB Response mrxsmb20.sys null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Microsoft Windows 8.1/10/Server 2012/Server 2016 (Operating System) and classified as critical. This issue affects an unknown code block in the library mrxsmb20.sys of the component SMB Response Handler. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability.

The bug was discovered 02/01/2017. The weakness was released 02/02/2017 by PythonResponder as VU#867968 as confirmed advisory ( The advisory is shared at The public release happened without involvement of Microsoft. The identification of this vulnerability is CVE-2017-0016 since 09/09/2016. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details as well as a public exploit are known.

A public exploit has been developed in Python and been published before and not just after the advisory. The exploit is available at It is declared as functional. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 97743 (MS17-012: Security Update for Microsoft Windows (4013078)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 370297 (Microsoft Cumulative Security Update for Windows (MS17-012)).

It is possible to mitigate the problem by applying the configuration setting Disable SMB. A possible mitigation has been published 2 months after the disclosure of the vulnerability. Attack attempts may be identified with Snort ID 41499.

The vulnerability is also documented in the vulnerability database at Tenable (97743). Entries connected to this vulnerability are available at 98053, 98054, 98055 and 98056.







CPE 2.3info

CPE 2.2info


Youtube: Not available anymore


VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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NVD Base Score: 5.9
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Class: Null pointer dereference
CWE: CWE-476 / CWE-404
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Functional
Programming Language: 🔍
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Nessus ID: 97743
Nessus Name: MS17-012: Security Update for Microsoft Windows (4013078)
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OpenVAS ID: 802074
OpenVAS Name: Microsoft Windows Multiple Vulnerabilities (4013078)
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Threat Intelligenceinfo

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Recommended: Config
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Config: Disable SMB

Snort ID: 41499
Snort Message: SERVER-SAMBA Microsoft Windows SMBv2/SMBv3 Buffer Overflow attempt
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Suricata ID: 2023832
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09/09/2016 🔍
02/01/2017 +145 days 🔍
02/01/2017 +0 days 🔍
02/02/2017 +1 days 🔍
02/02/2017 +0 days 🔍
02/02/2017 +0 days 🔍
02/03/2017 +1 days 🔍
03/14/2017 +39 days 🔍
03/15/2017 +1 days 🔍
03/16/2017 +1 days 🔍
11/11/2022 +2066 days 🔍



Advisory: VU#867968
Researcher: PythonResponder
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-0016 (🔍)

SecurityTracker: 1037767
SecurityFocus: 95969 - Microsoft Windows CVE-2017-0016 Memory Corruption Vulnerability

scip Labs:
See also: 🔍


Created: 02/03/2017 05:03 PM
Updated: 11/11/2022 02:10 PM
Changes: 02/03/2017 05:03 PM (83), 10/20/2019 04:54 PM (22), 11/11/2022 02:10 PM (3)
Complete: 🔍


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