Vulnerability identifier: #VU56620

Vulnerability risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-33719

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SIPROTEC 5 relays with CPU variants CP150
Hardware solutions / Firmware
SIPROTEC 5 relays with CPU variants CP200
Hardware solutions / Firmware
SIPROTEC 5 relays with CPU variants CP050
Hardware solutions / Firmware
SIPROTEC 5 relays with CPU variants CP100
Hardware solutions / Firmware
SIPROTEC 5 relays with CPU variants CP300
Hardware solutions / Firmware

Vendor: Siemens

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error. A remote attacker can send a specially crafted packet, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SIPROTEC 5 relays with CPU variants CP150: All versions

SIPROTEC 5 relays with CPU variants CP200: All versions

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External links
http://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf

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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.