Vulnerability identifier: #VU49082

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-2020-27718

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
BIG-IP Advanced WAF
Client/Desktop applications / Antivirus software/Personal firewalls
BIG-IP ASM
Hardware solutions / Security hardware applicances

Vendor: F5 Networks

Description

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

The vulnerability exists due to application does not properly control consumption of internal resources when processing requests with JSON payload. A remote attacker can send an unusually large number of parameters and consume all available CPU resources on the system.

Only BIG-IP ASM systems configured with JSON content profile with parameter parsing (enabled by default) are affected.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

BIG-IP Advanced WAF: 11.6.1 - 16.0.0

BIG-IP ASM: 11.6.1 - 16.0.0

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External links
http://support.f5.com/csp/article/K58102101

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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.