Denial of service in F5 BIG-IP ASM and Advanced WAF
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-27718 |
| CWE-ID | CWE-400 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
BIG-IP Advanced WAF Client/Desktop applications / Antivirus software/Personal firewalls BIG-IP ASM Hardware solutions / Security hardware applicances |
| Vendor | F5 Networks |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Resource exhaustion
EUVDB-ID: #VU49082
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 - Resource exhaustion
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsBIG-IP Advanced WAF: 11.6.1 - 16.0.0
BIG-IP ASM: 11.6.1 - 16.0.0
External linkshttp://support.f5.com/csp/article/K58102101
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.
