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.

CVSS v4.0

6.7 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.38% chance of exploitation in the next 30 days, 30th percentile

Published

2026-01-15

Updated

2026-01-16

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/49966
• https://www.vulncheck.com/advisories/backup-key-recovery-denial-of-service-poc

References

• CVE Record
• NVD entry

Related

• CVE-2021-47812
• CVE-2021-47814
• CVE-2021-47811
• CVE-2021-47815
• CVE-2021-47810
• CVE-2021-47816