Vulnerability identifier: #VU55314

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-36754

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
PowerDNS Authoritative
Server applications / DNS servers

Vendor: PowerDNS.COM B.V.

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

PowerDNS Authoritative: 4.5.0

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External links
http://docs.powerdns.com/authoritative/security-advisories/powerdns-advisory-2021-01.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.