### [CVE-2021-3716](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3716)
![](https://img.shields.io/static/v1?label=Product&message=nbdkit&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=Affects%20nbdkit%20v1.12%20through%20v1.26.4%20%7C%20Fixedin%20nbdkit%20v1.26.5%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-924&color=brightgreen)

### Description

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon