How severe is CVE-2021-47818?

CVE-2021-47818 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-47818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47818?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2021-47818 have an EU (EUVD) identifier?

Yes. CVE-2021-47818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2908.

When was CVE-2021-47818 published?

CVE-2021-47818 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2021-47818

CVE-2021-47818 is a high-severity vulnerability with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 4.6
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2908
Weakness: CWE-1284
Published: 2026-01-16
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-47818?: 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.
How severe is CVE-2021-47818?: CVE-2021-47818 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-47818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47818?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-47818 have an EU (EUVD) identifier?: Yes. CVE-2021-47818 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2908.
When was CVE-2021-47818 published?: CVE-2021-47818 was published on 2026-01-16 and last updated on 2026-06-17.

References

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