#VU70375 Input validation error in Siemens products - CVE-2021-44694

Vulnerability identifier: #VU70375

Vulnerability risk: Low

CVSSv4.0: 4.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-44694

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC ET 200SP Open Controller CPU 1515SP PC2
Server applications / SCADA systems
SIMATIC S7-PLCSIM Advanced
Server applications / SCADA systems
SIMATIC S7-1500
Hardware solutions / Firmware
TIM 1531 IRC
Hardware solutions / Firmware
SIPLUS TIM 1531 IRC
Hardware solutions / Firmware
SIMATIC Drive Controller
Hardware solutions / Firmware
SIMATIC S7-1200 CPU family
Hardware solutions / Firmware
SIMATIC S7-1500 CPU
Hardware solutions / Firmware

Vendor: Siemens

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote administrator can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC ET 200SP Open Controller CPU 1515SP PC2: All versions

SIMATIC S7-1500: All versions

TIM 1531 IRC: All versions

SIPLUS TIM 1531 IRC: All versions

SIMATIC Drive Controller: before 3.0.1

SIMATIC S7-1200 CPU family: before 4.6.0

SIMATIC S7-1500 CPU: before 3.0.1

SIMATIC S7-PLCSIM Advanced: before 5.0

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External links
https://cert-portal.siemens.com/productcert/pdf/ssa-382653.pdf

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated privileged user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.