Resource exhaustion in BIG-IP Advanced WAF and BIG-IP ASM - CVE-2020-27718
Published: December 17, 2020
Vulnerability identifier: #VU49082
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-27718
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
BIG-IP Advanced WAF
BIG-IP ASM
BIG-IP ASM
How to mitigate CVE-2020-27718
Install updates from vendor's website.
BIG-IP Advanced WAF - addressed in versions 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1
BIG-IP ASM - addressed in versions 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1
BIG-IP ASM - addressed in versions 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1