Vulnerability identifier: #VU58505

Vulnerability risk: High

CVSSv3.1: 7.8 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35535

CWE-ID: CWE-94

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Relion 670 series
Server applications / SCADA systems
Relion 650 series
Server applications / SCADA systems
Relion SAM600-IO
Server applications / SCADA systems

Vendor: ABB

Description

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

The vulnerability exists in the early boot process of the product in which there is a tiny time gap where a previous version of VxWorks is loaded prior to booting up the complete application firmware. A remote attacker can execute arbitrary code on the target device before the operating system is loaded.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Relion 670 series: 2.2.0 - 2.2.4

Relion 650 series: 2.2.0 - 2.2.4

Relion SAM600-IO: 2.2.1

---

External links
http://search.abb.com/library/Download.aspx?DocumentID=8DBD000061&LanguageCode=en&DocumentPartId=&Action=Launch

---

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.