Denial of service in PowerDNS Authoritative

Published: 2021-07-26
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-36754
Exploitation vector Network
Public exploit N/A
Vulnerable software
PowerDNS Authoritative
Server applications / DNS servers

Vendor PowerDNS.COM B.V.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU55314

Risk: Medium


CVE-ID: CVE-2021-36754

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition when processing DNS queries. A remote attacker can send a specially crafted query with QTYPE 65535, trigger an out-of-bounds read error and perform a denial of service (DoS) attack.


Install updates from vendor's website.

Vulnerable software versions

PowerDNS Authoritative: 4.5.0

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?