#VU48917 Uncaught Exception in SIMATIC ET 200SP Open Controller and SIMATIC S7-1500 Software Controller - CVE-2020-15796

Vulnerability identifier: #VU48917

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-15796

CWE-ID: CWE-248

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIMATIC ET 200SP Open Controller
Server applications / SCADA systems
SIMATIC S7-1500 Software Controller
Server applications / SCADA systems

Vendor: Siemens

Description

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

The vulnerability exists due to uncaught exception. A remote attacker can send a specially crafted HTTP request to the products web server and cause a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIMATIC ET 200SP Open Controller: 20.8

SIMATIC S7-1500 Software Controller: 20.8

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External links
https://ics-cert.us-cert.gov/advisories/icsa-20-343-09

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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.