Vulnerability identifier: #VU49068

Vulnerability risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-27725

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP DNS
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP Link Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
BIG-IP GTM
Hardware solutions / Security hardware applicances

Vendor: F5 Networks

Description
The vulnerability allows a remote user to perform DoS attack on the target system.

The vulnerability exists due memory leak in zxfrd process when listing DNS zones. A remote user with access to TMSH, iControl or SNMP can force the application to leak memory and perform denial of service attack.

This vulnerability affects only BIG-IP systems that are provisioned with BIG-IP DNS or BIG-IP GTM and at least one DNS zone.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP DNS: 11.6.1 - 15.1.0.5

BIG-IP GTM: 11.6.1 - 15.1.0.5

BIG-IP Link Controller: 11.6.1 - 15.1.0.5

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External links
http://support.f5.com/csp/article/K25595031

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

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