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Windows CVE-2024-54019

| EUVDEUVD-2025-17801 MEDIUM
Improper Validation of Certificate with Host Mismatch (CWE-297)
2025-06-10 psirt@fortinet.com
Windows Authentication Bypass Fortinet Forticlient
4.8
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-297
OWASP Top 10:2025
A07:2025 - Authentication Failures
ASVS 5.0
V12 - Secure Communication Certificate host validation
Impact

CVSS 4.8. EPSS 0.0%. No patch confirmed.
Exploit ScenarioDerived

An attacker could exploit this vulnerability in Fortinet FortiClientWindows to compromise the security of affected deployments, potentially impacting confidentiality, integrity, or availability.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 14, 2026

A security vulnerability in Fortinet FortiClientWindows (CVSS 4.8) that allows an unauthorized attacker. Remediation should follow standard vulnerability management procedures.

Earlier versions of this analysis (1)
v1 Mar 14, 2026 - 19:49 CVSS 4.8

A improper validation of certificate with host mismatch in Fortinet FortiClientWindows version 7.4.0, versions 7.2.0 through 7.2.6, and 7.0 all versions allow an unauthorized attacker to redirect VPN

RemediationAI

Monitor vendor channels for patch availability.

Affected VersionsENISA

FortiClientWindows 7.0.0 ≤7.0.14
FortiClientWindows 7.2.0 ≤7.2.6
FortiClientWindows 7.4.0

Affected Packages

euvd forticlientwindows no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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Technical ContextAI · show details

Vulnerability type not specified by vendor. Affects Fortinet FortiClientWindows.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

NVD PRIMARY 4.8 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

DescriptionCVE.org

A improper validation of certificate with host mismatch in Fortinet FortiClientWindows version 7.4.0, versions 7.2.0 through 7.2.6, and 7.0 all versions allow an unauthorized attacker to redirect VPN connections via DNS spoofing or another form of redirection.

Executive ViewAI

Why It Matters

Organizations using Fortinet FortiClientWindows should be aware of moderate risk from CVE-2024-54019 rated CVSS 4.8. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 91% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD 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 MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
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
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
Low

Priority Score

24
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +24
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.

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Same weakness CWE-297 – Improper Validation of Certificate with Host Mismatch

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Same technique Authentication Bypass

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References

Advisories & patches
ADVISORY https://fortiguard.fortinet.com/psirt/FG-IR-24-365 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2024-54019

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