Operation on a Resource after Expiration or Release in Siemens products - CVE-2021-37204
Published: February 11, 2022
Vulnerability identifier: #VU60531
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-37204
CWE-ID: CWE-672
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to operation on a resource after expiration or release in a PLC. A remote attacker can send a specially crafted packet and perform a denial of service (DoS) attack.
Affected software
SIMATIC ET 200SP Open Controller CPU 1515SP PC2
SIMATIC S7-1500 Software Controller
SIMATIC S7-PLCSIM Advanced
SIMATIC S7-1500 CPU
SIMATIC S7-1200 CPU family
SIMATIC TIM 1531 IRC
SIMATIC Drive Controller
SIMATIC S7-1500 Software Controller
SIMATIC S7-PLCSIM Advanced
SIMATIC S7-1500 CPU
SIMATIC S7-1200 CPU family
SIMATIC TIM 1531 IRC
SIMATIC Drive Controller
How to mitigate CVE-2021-37204
Install updates from vendor's website.
SIMATIC S7-1500 CPU - update to 2.9.4
SIMATIC S7-1200 CPU family - update to 4.5.2
SIMATIC TIM 1531 IRC - update to 2.2
SIMATIC Drive Controller - update to 2.9.4
SIMATIC S7-1200 CPU family - update to 4.5.2
SIMATIC TIM 1531 IRC - update to 2.2
SIMATIC Drive Controller - update to 2.9.4