What is CVE-2021-47813?

CVE-2021-47813 is a high-severity vulnerability in Nsauditor Backup Key Recovery, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-01-15.

How severe is CVE-2021-47813?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Nsauditor Backup Key Recovery

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 re…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (8.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Nsauditor Backup Key Recovery — versions 2.2.7.0

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

ExploitDB-49966 (exploit)
Vendor Homepage (product)
VulnCheck Advisory: Backup Key Recovery 2.2.7 - Denial of Service (PoC) (third-party-advisory)

Frequently asked questions

What is CVE-2021-47813?: CVE-2021-47813 is a high-severity vulnerability in Nsauditor Backup Key Recovery, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2026-01-15.
How severe is CVE-2021-47813?: High severity. CVSS v3 base score is 7.5 out of 10.