Buffer overflow in Siemens products - CVE-2021-33720
Published: September 15, 2021
Vulnerability identifier: #VU56621
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2021-33720
CWE-ID: CWE-119
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 a boundary error. A remote attacker can send a specially crafted packet, trigger memory corruption and cause a denial of service condition on the target system.
Affected software
SIPROTEC 5 relays with CPU variants CP150
SIPROTEC 5 relays with CPU variants CP200
SIPROTEC 5 relays with CPU variants CP050
SIPROTEC 5 relays with CPU variants CP100
SIPROTEC 5 relays with CPU variants CP300
SIPROTEC 5 relays with CPU variants CP200
SIPROTEC 5 relays with CPU variants CP050
SIPROTEC 5 relays with CPU variants CP100
SIPROTEC 5 relays with CPU variants CP300
How to mitigate CVE-2021-33720
Install updates from vendor's website.
SIPROTEC 5 relays with CPU variants CP050 - update to 8.80
SIPROTEC 5 relays with CPU variants CP100 - update to 8.80
SIPROTEC 5 relays with CPU variants CP300 - update to 8.80
SIPROTEC 5 relays with CPU variants CP100 - update to 8.80
SIPROTEC 5 relays with CPU variants CP300 - update to 8.80