CVE-2018-0833

MEDIUM

Windows 8.1, RT 8.1, and Server 2012 R2 - Denial of Service via SMBv2/SMBv3 Client Null Pointer Dereference

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2018-0833. PoCs published by Nabeel Ahmed.

AI-analyzed exploit summary This exploit triggers a null pointer dereference in the Microsoft Windows SMB client (SMBv3) by sending a malformed SMB packet, leading to a denial of service (BSoD). The payload is a hex-encoded string sent over TCP port 445.

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".

Exploits (1)

exploitdb WORKING POC VERIFIED
by Nabeel Ahmed · pythondoswindows
https://www.exploit-db.com/exploits/44189

This exploit triggers a null pointer dereference in the Microsoft Windows SMB client (SMBv3) by sending a malformed SMB packet, leading to a denial of service (BSoD). The payload is a hex-encoded string sent over TCP port 445.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Microsoft Windows SMB Client (SMBv3) on Windows 8.1 (x86) and Windows Server 2012 R2 (x64)
No auth needed
Prerequisites: Network access to target's SMB port (445)
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/102924
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1040375
Exploit, Third Party Advisory x_refsource_misc
https://github.com/KINGSABRI/CVE-in-Ruby/tree/master/CVE-2018-0833
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/44189/

Scores

CVSS v3 5.3
EPSS 0.4130
EPSS Percentile 98.5%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

CWE
CWE-476
Status published
Products (3)
microsoft/windows_8.1
microsoft/windows_rt_8.1
microsoft/windows_server_2012 r2
Published Feb 15, 2018
Tracked Since Feb 18, 2026