Denial of service in F5 BIG-IP CGNAT LSN



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-27720
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 BIG-IP LTM
Hardware solutions / Security hardware applicances

Vendor F5 Networks

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU49077

Risk: Medium

CVSSv4.0: 6.6 [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/E:U/U:Green]

CVE-ID: CVE-2020-27720

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of network traffic in CGNAT LSN when processing NAT66 traffic with Port Block Allocation (PBA) mode and SP-DAG enabled, and dag-ipv6-prefix-len configured with a value less than the default of 128. A remote attacker can pass specially crafted input and cause the Traffic Management Microkernel (TMM) to restart.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

BIG-IP LTM: 13.1.0 - 16.0.0

CPE2.3 External links

https://support.f5.com/csp/article/K04048104


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.



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