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CVE-2018-8171

28
FAUCET Score

CVE-2018-8171 is a security feature bypass vulnerability in ASP.NET, ASP.NET Core (versions 1.0, 1.1, 2.0), and ASP.NET MVC 5.2, stemming from a failure to validate the number of incorrect login attempts. This allows an attacker to bypass security measures. With a CVSS score of 7.5 (High), it is easily exploitable over the network with low attack complexity, potentially leading to high integrity impacts, though confidentiality and availability are not directly affected. Despite its high FAUCET Risk Score of 84/100 and community discussion, there is no evidence of active exploitation, no exploit code available in common databases like Metasploit or ExploitDB, and it is not listed in CISA's KEV catalog.

Impacted Technologies

VendorProductVersion(s)CPE
1.0CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:1.0:*:*:*:*:*:*:*
1.1CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:1.1:*:*:*:*:*:*:*
2.0CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_core:2.0:*:*:*:*:*:*:*
5.2CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_model_view_controller:5.2:*:*:*:*:*:*:*
3.2.3CPE matchmatch criteria
cpe:2.3:a:microsoft:asp.net_webpages:3.2.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
9.83%
Probability of exploitation in next 30 days
EPSS Percentile
95.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0983 is in the 92nd percentile among its peer group of 51,466 CVEs.

Social Chatter

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

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (16)

microsoftpatch availablevia msrc
Product: ASP.NET Web Pages 3.2.3 on Microsoft Visual Studio 2015 Update 3
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 1.0
View patch
microsoftpatch availablevia msrc
Product: ASP.NET MVC 5.2 on Microsoft Visual Studio 2013 Update 5
View patch
microsoftpatch availablevia msrc
Product: ASP.NET MVC 5.2 on Microsoft Visual Studio 2015 Update 3
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Web Pages 3.2.3 on Microsoft Visual Studio 2013 Update 5
View patch
microsoftpatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 11543-10566
View patch
microsoftpatch availablevia msrc
Product: 11543-10577
View patch
microsoftpatch availablevia msrc
Product: 11544-10566
View patch
microsoftpatch availablevia msrc
Product: 11544-10577
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 2.0
View patch
microsoftpatch availablevia msrc
Product: ASP.NET Core 1.1
View patch
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.IdentityFixed in: 1.1.6
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.IdentityFixed in: 2.0.4
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.IdentityFixed in: 2.1.2
nugetpatch availablevia ghsa
Product: Microsoft.AspNetCore.IdentityFixed in: 1.0.6

Vendor Advisories (2)

nugetGHSA-vhvh-528q-ff3phigh

Security feature bypass vulnerability exists in ASP.NET when the number of incorrect login attempts is not validated

Oct 16, 2018
microsoft2018-Jul/CVE-2018-8171Important

ASP.NET Security Feature Bypass Vulnerability

Jul 10, 2018

References

portal.msrc.microsoft.com / en-US/security-guidance/advisory/CVE-2018-8171
PatchVendor Advisory
securityfocus.com / bid/104659
Third Party AdvisoryVDB Entry
securitytracker.com / id/1041267
Third Party AdvisoryVDB Entry