The Web Proxy Auto Discovery (WPAD) protocol implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 S…

published 2016-06-16 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-4252

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 66.9%; EPSS 66.9% chance of exploitation in 30 days, percentile 99.3%
public exploits: 1; Metasploit

The Web Proxy Auto Discovery (WPAD) protocol implementation 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, Windows 10 Gold and 1511, and Internet Explorer 9 through 11 has an improper fallback mechanism, which allows remote attackers to gain privileges via NetBIOS name responses, aka "WPAD Elevation of Privilege Vulnerability."

Timeline

2016-06-14 First public exploit (Metasploit auxiliary/server/netbios_spoof_nat)
2016-06-16 Published

Exploit prediction

66.90% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Metasploit auxiliary/server/netbios_spoof_nat NetBIOS Response "BadTunnel" Brute Force Spoof (NAT Tunnel) metasploit auxiliary, normal rank, 2016-06-14

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	2.0	9.3	AV:N/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-264 Permissions, Privileges, and Access Controls

References

docs.microsoft.com /en-us/security-updates/securitybulletins/2016/ms16-077
vendor-advisory
docs.microsoft.com /en-us/security-updates/securitybulletins/2016/ms16-063
vendor-advisory
securitytracker.com /id/1036096
vdb-entry
securitytracker.com /id/1036104
vdb-entry

Sources

CVE List CVE-2016-3213
NVD CVE-2016-3213

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary