How severe is CVE-2021-47813?

CVE-2021-47813 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-2021-47813 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-47813?

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-2021-47813 have an EU (EUVD) identifier?

Yes. CVE-2021-47813 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3029.

When was CVE-2021-47813 published?

CVE-2021-47813 was published on 2026-01-16 and last updated on 2026-06-17.

CVE-2021-47813

CVE-2021-47813 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.7
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3029
Weakness: CWE-120
Published: 2026-01-16
Last modified: 2026-06-17

Description

Backup Key Recovery 2.2.7 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the registration code input field. Attackers can paste a large buffer of 256 repeated characters into the registration key field to trigger application instability and potential crash.

Frequently asked questions

What is CVE-2021-47813?: Backup Key Recovery 2.2.7 contains a denial of service vulnerability that allows attackers to crash the application by overflowing the registration code input field. Attackers can paste a large buffer of 256 repeated characters into the registration key field to trigger application instability and potential crash.
How severe is CVE-2021-47813?: CVE-2021-47813 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-2021-47813 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-47813?: 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-2021-47813 have an EU (EUVD) identifier?: Yes. CVE-2021-47813 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3029.
When was CVE-2021-47813 published?: CVE-2021-47813 was published on 2026-01-16 and last updated on 2026-06-17.

References

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