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CVE-2016-0049

31
FAUCET Score

CVE-2016-0049 is a Kerberos security feature bypass vulnerability affecting various versions of Microsoft Windows, including Windows Vista, 7, 8.1, 10, and Server 2008/2012. This flaw allows remote attackers to bypass authentication by deploying a crafted Key Distribution Center (KDC) and performing a sign-in action, as the system fails to properly validate password changes. The vulnerability has a CVSS score of 6.2 (Medium) and is rated with a FAUCET Risk Score of 85/100, indicating a high impact on integrity (I:H) with low attack complexity (AC:L). While not listed in CISA's KEV catalog, an exploit (EDB-39442) is publicly available on ExploitDB, and it has garnered significant community discussion and media coverage, including articles detailing a "Malicious Butler" attack scenario.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
1511CPE matchmatch criteria
cpe:2.3:o:microsoft:windows_10:1511:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:*:*
All Versions ImpactedCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_server_2008:*:sp2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.2MEDIUM

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.5
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
13.39%
Probability of exploitation in next 30 days
EPSS Percentile
96.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-39442 · Feb 15, 2016
This CVE's current EPSS score of 0.1339 is in the 100th percentile among its peer group of 3,050 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/135797/Windows-Kerberos-Security-Feature-Bypass.html
docs.microsoft.com / en-us/security-updates/securitybulletins/2016/ms16-014
exploit-db.com / exploits/39442
securityfocus.com / bid/82535
securitytracker.com / id/1034985