CVE-2021-47813

HIGH

Backup Key Recovery 2.2.7 - Denial of Service via Registration Code Input Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-47813. PoCs published by Erick Galindo.

AI-analyzed exploit summary This PoC exploits a buffer overflow vulnerability in Backup Key Recovery 2.2.7 by sending a 256-byte string of 'A' characters to the registration key field, causing a denial of service (DoS). The exploit is straightforward and targets the software's input validation flaw.

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.

Exploits (1)

exploitdb WORKING POC
by Erick Galindo · pythonlocalwindows
https://www.exploit-db.com/exploits/49966

This PoC exploits a buffer overflow vulnerability in Backup Key Recovery 2.2.7 by sending a 256-byte string of 'A' characters to the registration key field, causing a denial of service (DoS). The exploit is straightforward and targets the software's input validation flaw.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: Backup Key Recovery 2.2.7.0
No auth needed
Prerequisites: Access to the Backup Key Recovery application · Ability to input data into the registration key field
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/49966
Various Sources product
http://www.nsauditor.com

Scores

CVSS v3 7.5
EPSS 0.0036
EPSS Percentile 27.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-120
Status published
Published Jan 16, 2026
Tracked Since Feb 18, 2026