Vulnerability identifier: #VU28748

Vulnerability risk: High

CVSSv3.1: 7.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5591

CWE-ID: CWE-399

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
XACK DNS
Server applications / Other server solutions

Vendor: XACK,Inc.

Description

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

The vulnerability exists due to improper management of internal resources with the applicatoin when using the cache server feature. A remote attacker can perform a NXNSAttack and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

XACK DNS: 1.7.0 - 1.11.4

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External links
http://jvn.jp/en/jp/JVN40208370/index.html
http://www.nxnsattack.com/

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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.