Cisco has warned owners of the ENCS 5400-W and CSP 5000-W series network equipment of a bug where attackers can use a default password. That password cannot be changed, so there must be a software update.
Specifically, it concerns a vulnerability in Cisco’s virtualization software Enterprise NFV Infrastructure Software in Virtual Wide Area Application Services, or vWAAS, on the ENCS 5400-W and CSP 5000-W. According to Cisco, those devices contain user accounts with a default password. An attacker who can access the command line interface of the NFV Infrastructure software can easily log in with admin rights to the devices with such an account.
There are several options for getting into the command line, says Cisco. For example, it may be that Ethernet management is open to the outside, or an attacker can first establish a connection with the Integrated Management Controller.
Cisco writes that there is currently no work-around for the problem. However, the company has released a patch. The vulnerability, CVE-2020-3446, occurs in versions 6.4.5 and 6.4.3d or older of the NFV software.