PT-2021-21574 · Siemens · Siprotec 5

Published 2021-09-14 · Updated 2021-12-14 · CVE-2021-37206

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions SIPROTEC 5 relays with CPU variants CP050 versions prior to V8.80 SIPROTEC 5 relays with CPU variants CP100 versions prior to V8.80 SIPROTEC 5 relays with CPU variants CP200 versions prior to V8.80 SIPROTEC 5 relays with CPU variants CP300 versions prior to V8.80

Description A vulnerability has been identified where received webpackets are not properly processed. An unauthenticated remote attacker with access to any of the Ethernet interfaces could send specially crafted packets to force a restart of the target device.

Recommendations For SIPROTEC 5 relays with CPU variants CP050 versions prior to V8.80, update to version V8.80 or later. For SIPROTEC 5 relays with CPU variants CP100 versions prior to V8.80, update to version V8.80 or later. For SIPROTEC 5 relays with CPU variants CP200 versions prior to V8.80, update to version V8.80 or later. For SIPROTEC 5 relays with CPU variants CP300 versions prior to V8.80, update to version V8.80 or later. As a temporary workaround, consider restricting access to the Ethernet interfaces to minimize the risk of exploitation.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2021-37206

Affected Products

Siprotec 5

References · 4

• https://osv.dev/vulnerability/CVE-2021-37206 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-37206 · Security Note
• https://cert-portal.siemens.com/productcert/pdf/ssa-500748.pdf · Vendor Advisory
• https://t.me/cibsecurity/28788 · Telegram Post