#VU55778 Improper Authorization in Siemens products - CVE-2020-28397

Vulnerability identifier: #VU55778

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2020-28397

CWE-ID: CWE-285

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
SIMATIC ET 200SP Open Controller CPU 1515SP PC2
SIMATIC S7-PLCSIM Advanced
SIMATIC S7-1500 Software Controller
SIMATIC S7-1200 CPU family
SIMATIC S7-1500 CPU
TIM 1531 IRC
SIMATIC Drive Controller

Software vendor:
Siemens

The vulnerability allows a remote attacker to bypass authorization checks.

The vulnerability exists due to insufficient authorization checks. A remote attacker can read PLC variables from the affected devices.

Install updates from vendor's website.

• https://cert-portal.siemens.com/productcert/pdf/ssa-865327.pdf