#VU56621 Buffer overflow


Published: 2021-09-15

Vulnerability identifier: #VU56621

Vulnerability risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-33720

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 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.

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

SIPROTEC 5 relays with CPU variants CP050: before 8.80

SIPROTEC 5 relays with CPU variants CP100: before 8.80

SIPROTEC 5 relays with CPU variants CP300: before 8.80

CPE

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


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.


Latest bulletins with this vulnerability