NULL dereference when processing SMB traffic in Microsoft Windows

Published: 2017-02-03 | Updated: 2017-03-14
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-0016
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Operating systems & Components / Operating system

Windows Server
Operating systems & Components / Operating system

Vendor Microsoft

Security Bulletin

This security bulletin contains information about 1 vulnerabilities.

2017-03-14: Severity of this vulnerability was decreased from critical to medium. Added information about security patch.

1) NULL pointer dereference


Risk: Medium


CVE-ID: CVE-2017-0016

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No


The vulnerability allows a remote attacker to cause denial of service.

The vulnerability exists due to a NULL pointer dereference error when processing Server Message Block (SMB) network traffic. A remote attacker can send specially crafted response, containing too many bytes following the structure defined in the SMB2 TREE_CONNECT Response structure and cause the affected system to crash.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service (DoS) attack.

Note: the exploit code for this vulnerability is publicly available.


Install updates from vendor's website.

Vulnerable software versions

Windows: 8.1 - 10

Windows Server: 2012 - 2016

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?