CVE-2021-47688 Race condition in WhiteBeam
A local attacker can bypass allow-list restrictions by exploiting a race condition between file truncation and verification actions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-47688?
CVE-2021-47688 is a medium-severity vulnerability in WhiteBeam, published on 23 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In WhiteBeam 0.2.0 through 0.2.1 before 0.2.2, a user with local access to a server can bypass the allow-list functionality because a file can be truncated in the OpenFileDescriptor action before the VerifyCanWrite action is performed.
Weakness: CWE-696
Which versions are affected by CVE-2021-47688?
How do I fix CVE-2021-47688?
No fix has been published for CVE-2021-47688 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-47688 being exploited?
There is no known exploitation of CVE-2021-47688 in the wild and no public exploit code.
Sources
Also known as GHSA-3f8r-9483-pfxj, GHSA-fjgv-863q-h54r.