Denial of Service Vulnerability in Backup Key Recovery Software
CVE-2021-47813

6.7MEDIUM

Key Information:

Vendor

Nsauditor

Status
Backup Key Recovery
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47813?

Backup Key Recovery version 2.2.7 is susceptible to a denial of service vulnerability where an attacker can exploit a buffer overflow in the registration code input field. By inputting a long sequence of repeated characters, malicious actors can destabilize the application, leading to potential crashes. This vulnerability highlights the need for developers to implement robust input validation to mitigate such risks.

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Affected Version(s)

Backup Key Recovery 2.2.7.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47813 - Proof of Concept

References

https://www.exploit-db.com/exploits/49966
exploit
http://www.nsauditor.com
product
https://www.vulncheck.com/advisories/backup-key-recovery-...
third-party-advisory

CVSS V4

Score:
6.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Erick Galindo
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