What is the CVSS score of CVE-2020-1464?

CVE-2020-1464 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 41.1%.

Is there a public PoC exploit available for CVE-2020-1464?

Yes, a public proof-of-concept exploit is available for CVE-2020-1464. Prioritise patching immediately. EPSS: 41.1%.

Is there a patch available for CVE-2020-1464?

Yes, a patch is available for CVE-2020-1464. Update the affected software to the latest version immediately.

Jwt Attack CVE-2020-1464

HIGH

Improper Verification of Cryptographic Signature (CWE-347)

2020-08-17 secure@microsoft.com

Authentication Bypass Microsoft Jwt Attack Windows 10 1507 Windows 10 1607 Windows 10 1809 Windows Server 2008 Windows Server 2012 Windows Server 2016 Windows Server 2019 Windows 7 Windows 8 1 Windows Rt 8 1 Windows 10 1909 Windows Server 2004 Windows 10 1709 Windows 10 1803 Windows 10 1903 Windows Server 1903 Windows Server 1909 Windows 10 2004

7.8

CVSS 3.1 · Vendor: microsoft

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Vulnerability Assessment

Weakness	CWE CWE-347 OWASP Top 10:2025 A04:2025 - Cryptographic Failures ASVS 5.0 V11 - Cryptography Signature verification
Impact	CVSS score of 7.8 (HIGH). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required. Public proof-of-concept exploit code is available.
Exploit ScenarioDerived	Successful exploitation could compromise the high-severity affected system.

This Week Schedule remediation this week. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 41.1% exploitation probability (EPSS)

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AnalysisAI

A spoofing vulnerability exists when Windows incorrectly validates file signatures. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. Public exploit code available.

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.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

This vulnerability is classified under CWE-347. A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded. The update addresses the vulnerability by correcting how Windows validates file signatures. Affected products include: Microsoft Windows 10 1507, Microsoft Windows 10 1607, Microsoft Windows 10 1709, Microsoft Windows 10 1803, Microsoft Windows 10 1809.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (microsoft) PRIMARY 7.8 HIGH

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

Primary rating from Vendor (microsoft) · only source for this CVE.

CVSS VectorVendor: microsoft

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Aug 17, 2020 - 19:15 cve.org

HIGH 7.8

DescriptionCVE.org

A spoofing vulnerability exists when Windows incorrectly validates file signatures. An attacker who successfully exploited this vulnerability could bypass security features and load improperly signed files. In an attack scenario, an attacker could bypass security features intended to prevent improperly signed files from being loaded. The update addresses the vulnerability by correcting how Windows validates file signatures.

Threat Intelligence Overview

EPSS Score

41.1%

Top 1% exploitable

Exploit

POC

Public exploit code exists

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

CISA KEV

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 Yes

Public POC Yes

EPSS 41.1%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

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

Out-of-Cycle

Exploitation· derived

Active

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

High

Priority Score

150

Low Medium High Critical

KEV: +50

EPSS: +41

CVSS: +39

PoC: +20

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)CVE.org

cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1709:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_1903:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_1909:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2004:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*

cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*

cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*

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References

Advisories & patches

PATCH https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1464 REF https://blog.virustotal.com/2019/01/distribution-of-malicious-jar-appended.html REF https://krebsonsecurity.com/2020/08/microsoft-put-off-fixing-zero-day-for-2-years/ REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-1464

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