What is the CVSS score of CVE-2021-47818?

CVE-2021-47818 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of Windows are affected by CVE-2021-47818?

Organizations using DupTerminator 1.4.5639.37199 face notable risk from CVE-2021-47818 rated CVSS 7.5. Exploitation could compromise the security of affected deployments.

Is there a public PoC exploit available for CVE-2021-47818?

Yes, a public proof-of-concept exploit is available for CVE-2021-47818. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2021-47818?

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

Windows CVE-2021-47818

HIGH

Improper Validation of Specified Quantity in Input (CWE-1284)

2026-01-16 disclosure@vulncheck.com

Windows Denial Of Service

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 26, 2026 - 15:05 vuln.today

Public exploit code

CVE Published

Jan 16, 2026 - 19:16 nvd

HIGH 7.5

DescriptionCVE.org

DupTerminator 1.4.5639.37199 contains a denial of service vulnerability that allows attackers to crash the application by inputting a long character string in the Excluded text box. Attackers can generate a payload of 8000 repeated characters to trigger the application to stop working on Windows 10.