Denial of service in curl implementation for Command Line Interface, EAV Monitors, iRules components in F5 BIG-IP products

Published: 2021-02-19

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Uncontrolled Recursion

EUVDB-ID: #VU48894

Risk: Low


CVE-ID: CVE-2020-8285

CWE-ID: CWE-674 - Uncontrolled Recursion

Exploit availability: No


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

The vulnerability exists due tu uncontrolled recursion when processing FTP responses within the wildcard matching functionality, which allows a callback (set with <a href="">CURLOPT_CHUNK_BGN_FUNCTION</a>) to return information back to libcurl on how to handle a specific entry in a directory when libcurl iterates over a list of all available entries. A remote attacker who controls the malicious FTP server can trick the victim to connect to it and crash the application, which is using the affected libcurl version.


Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

BIG-IP DNS: 13.1.0 -

BIG-IP SSLO: 13.1.0 -

BIG-IP PEM: 13.1.0 -

BIG-IP Link Controller: 13.1.0 -

BIG-IP GTM: 13.1.0 -

BIG-IP FPS: 13.1.0 -

BIG-IP DDHD: 13.1.0 -

BIG-IP ASM: 13.1.0 -

BIG-IP Analytics: 13.1.0 -

BIG-IP AFM: 13.1.0 -

BIG-IP Advanced WAF: 13.1.0 -

BIG-IP AAM: 13.1.0 -

BIG-IP LTM: 13.1.0 -

BIG-IP: 13.1.0 -

BIG-IP APM: 13.1.0 -

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?