CVE-2016-3237

HIGH

Microsoft Windows Kerberos - Authentication Bypass via NTLM Fallback

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2016-3237. PoCs published by Nabeel Ahmed.

AI-analyzed exploit summary This is a detailed technical writeup describing a Kerberos to NTLM fallback vulnerability (CVE-2016-3237) that allows local privilege escalation by manipulating firewall rules and password changes. It outlines a step-by-step attack path but does not include functional exploit code.

Description

Kerberos in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8.1; Windows Server 2012 Gold and R2; Windows RT 8.1; and Windows 10 Gold, 1511, and 1607 allows man-in-the-middle attackers to bypass authentication via vectors related to a fallback to NTLM authentication during a domain account password change, aka "Kerberos Security Feature Bypass Vulnerability."

Exploits (1)

exploitdb WRITEUP VERIFIED
by Nabeel Ahmed · textlocalwindows
https://www.exploit-db.com/exploits/40409

This is a detailed technical writeup describing a Kerberos to NTLM fallback vulnerability (CVE-2016-3237) that allows local privilege escalation by manipulating firewall rules and password changes. It outlines a step-by-step attack path but does not include functional exploit code.

Classification
Writeup 90%
Attack Type
Auth Bypass
Complexity
Moderate
Reliability
Reliable
Target: Microsoft Windows Kerberos (Windows 7/10, fully patched as of 08/08/2016)
Auth required
Prerequisites: Physical access to target system · BitLocker enabled without PIN/USB key · Password caching enabled · Cached credentials present · Domain membership
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (4)

Core 4
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/92290
Patch, Vendor Advisory vendor-advisory x_refsource_ms
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-101
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1036576
Exploit, Third Party Advisory, VDB Entry exploit x_refsource_exploit-db
https://www.exploit-db.com/exploits/40409/

Scores

CVSS v3 7.5
EPSS 0.1718
EPSS Percentile 96.7%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-264
Status published
Products (11)
microsoft/windows_10
microsoft/windows_10 1511
microsoft/windows_7
microsoft/windows_8.1
microsoft/windows_rt
microsoft/windows_rt_8.1
microsoft/windows_server_2008
microsoft/windows_server_2008 r2 sp1 (2 CPE variants)
microsoft/windows_server_2012
microsoft/windows_server_2012 r2
... and 1 more
Published Aug 09, 2016
Tracked Since Feb 18, 2026