Man-in-the-Middle (MitM) attack in F5 BIG-IP APM and APM Clients

Published: 2020-04-30 | Updated: 2020-04-30
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-5893
Exploitation vector Network
Public exploit N/A
Vulnerable software
Hardware solutions / Security hardware applicances

APM Clients
Hardware solutions / Security hardware applicances

Vendor F5 Networks, Inc.

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Man-in-the-Middle (MitM) attack

EUVDB-ID: #VU27464

Risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-5893

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No


The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists when a user connects to a VPN using BIG-IP Edge Client over an unsecure network, BIG-IP Edge Client responds to authentication requests over HTTP while sending probes for captive portal detection. A remote attacker can perform a man-in-the-middle attack by deploying a malicious captive portal to obtain the encrypted NT Lan Manager (NTLM) challenge response.


Install updates from vendor's website.

Vulnerable software versions

BIG-IP APM: 11.6.1 - 15.1.0

APM Clients: 7.1.5 - 7.1.8

CPE2.3 External links

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.