CVE-2021-47813 Backup Key Recovery 2.2.7 - Denial of Service (PoC)
Attackers can crash the Backup Key Recovery application by inputting a large buffer into the registration key field, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-47813?
CVE-2021-47813 is a medium-severity denial of service vulnerability in Nsauditor Backup Key Recovery, published on 15 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-120
Which versions are affected by CVE-2021-47813?
How do I fix CVE-2021-47813?
No fix has been published for CVE-2021-47813 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-47813 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47813 exists.
Sources
Also known as GHSA-533p-5pv2-f9qj.