Resource exhaustion in Siemens products - CVE-2021-31340

Vulnerability identifier: #VU54016

CSH Severity: Medium

CVSSv4.0: 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-2021-31340

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
SIMATIC RF166C
SIMATIC RF185C
SIMATIC RF186C
SIMATIC RF186CI
SIMATIC RF188C
SIMATIC RF188CI
SIMATIC RF360R
SIMATIC RF615R
SIMATIC RF680R
SIMATIC RF685R

Software vendor:
Siemens

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

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Install updates from vendor's website.

• https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf
• https://us-cert.cisa.gov/ics/advisories/icsa-21-159-13