D-Link DVX-2000MS contains hard-coded credentials for undocumented user accounts in the '/etc/passwd' file. As weak passwords have been used, the plaintext passwords can be recovered from the hash values.

References

• https://nvd.nist.gov/vuln/detail/CVE-2021-39614
• https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10236
• https://www.dlink.com/en/security-bulletin/
• https://www.nussko.com/advisories/advisory-2021-08-01.txt