What is the CVSS score of CVE-2018-0786?

CVE-2018-0786 has a CVSS 3.0 base score of 7.5 (High). CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 3.7%.

Is there a patch available for CVE-2018-0786?

Yes, a patch is available for CVE-2018-0786. Update the affected software to the latest version immediately.

Net Framework CVE-2018-0786

HIGH

Improper Certificate Validation (CWE-295)

2018-01-10 secure@microsoft.com

Authentication Bypass Microsoft Net Framework Net Core Powershell Core

7.5

CVSS 3.0 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-295 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V12 - Secure Communication Certificate validation
Impact	CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 3.7% exploitation probability (EPSS)

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AnalysisAI

Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, .NET Core 1.0 and 2.0, and PowerShell Core 6.0.0 allow a security feature bypass vulnerability due to the. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affected Packages

nuget microsoft.netcore.universalwindowsplatform fix: 5.2.4, 5.3.5, 5.4.2, 6.0.6

nuget system.private.servicemodel fix: 4.1.1, 4.3.1, 4.4.1

nuget system.servicemodel.duplex fix: 4.0.2, 4.3.1, 4.4.1

nuget system.servicemodel.http fix: 4.1.1, 4.3.1, 4.4.1

nuget system.servicemodel.nettcp fix: 4.1.1, 4.3.1, 4.4.1

nuget system.servicemodel.primitives fix: 4.1.1, 4.3.1, 4.4.1

nuget system.servicemodel.security fix: 4.0.2, 4.3.1, 4.4.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 7 packages in nuget

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified under CWE-295. Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, .NET Core 1.0 and 2.0, and PowerShell Core 6.0.0 allow a security feature bypass vulnerability due to the way certificates are validated, aka ".NET Security Feature Bypass Vulnerability." Affected products include: Microsoft .Net Core, Microsoft Powershell Core, Microsoft .Net Framework.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

DescriptionNVD

Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, .NET Core 1.0 and 2.0, and PowerShell Core 6.0.0 allow a security feature bypass vulnerability due to the way certificates are validated, aka ".NET Security Feature Bypass Vulnerability."

Threat Intelligence Overview

EPSS Score

3.7%

Top 12% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 3.7%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +4

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)NVD

cpe:2.3:a:microsoft:.net_core:1.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_core:2.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:powershell_core:6.0:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:2.0:sp2:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:3.0:sp2:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:3.5.1:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.5.2:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6.1:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6.1:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.6.2:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.7:*:*:*:*:*:*:*

cpe:2.3:a:microsoft:.net_framework:4.7.1:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0786 REF http://www.securityfocus.com/bid/102380 REF http://www.securitytracker.com/id/1040152

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