CVE-2021-31893

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3), SIMATIC PDM (All versions < V9.2), SIMATIC STEP 7 V5.X (All versions < V5.6 SP2 HF3), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 HF2). The affected software contains a buffer overflow vulnerability while handling certain files that could allow a local attacker to trigger a denial-of-service condition or potentially lead to remote code execution.

Se ha identificado una vulnerabilidad en SIMATIC PCS 7 versiones V8.2 y anteriores (Todas las versiones), SIMATIC PCS 7 versiones V9.0 (Todas las versiones anteriores a V9.0 SP3), SIMATIC PDM (Todas las versiones anteriores a V9.2), SIMATIC STEP 7 versiones V5.X (Todas las versiones anteriores a V5.6 SP2 HF3), SINAMICS STARTER (que contiene la versión OEM de STEP 7) (Todas las versiones anteriores a V5.4 HF2). El software afectado contiene una vulnerabilidad de desbordamiento de búfer mientras se manejan determinados archivos que podría permitir a un atacante local desencadenar una condición de denegación de servicio o potencialmente conllevar a una ejecución de código remota

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-29 CVE Reserved
2021-07-13 CVE Published
2023-12-26 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf	2021-08-06

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Siemens Search vendor "Siemens"	Simatic Pcs Firmware Search vendor "Siemens" for product "Simatic Pcs Firmware"	<= 8.2 Search vendor "Siemens" for product "Simatic Pcs Firmware" and version " <= 8.2"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs Search vendor "Siemens" for product "Simatic Pcs"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pcs Firmware Search vendor "Siemens" for product "Simatic Pcs Firmware"	9.0 Search vendor "Siemens" for product "Simatic Pcs Firmware" and version "9.0"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs Search vendor "Siemens" for product "Simatic Pcs"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pcs Firmware Search vendor "Siemens" for product "Simatic Pcs Firmware"	9.0 Search vendor "Siemens" for product "Simatic Pcs Firmware" and version "9.0"	sp1	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs Search vendor "Siemens" for product "Simatic Pcs"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pcs Firmware Search vendor "Siemens" for product "Simatic Pcs Firmware"	9.0 Search vendor "Siemens" for product "Simatic Pcs Firmware" and version "9.0"	sp2	Affected	in	Siemens Search vendor "Siemens"	Simatic Pcs Search vendor "Siemens" for product "Simatic Pcs"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Pdm Firmware Search vendor "Siemens" for product "Simatic Pdm Firmware"	< 9.2 Search vendor "Siemens" for product "Simatic Pdm Firmware" and version " < 9.2"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Pdm Search vendor "Siemens" for product "Simatic Pdm"	-	-	Safe
Siemens Search vendor "Siemens"	Simatic Step 7 Firmware Search vendor "Siemens" for product "Simatic Step 7 Firmware"	<= 5.6 Search vendor "Siemens" for product "Simatic Step 7 Firmware" and version " <= 5.6"	-	Affected	in	Siemens Search vendor "Siemens"	Simatic Step 7 Search vendor "Siemens" for product "Simatic Step 7"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	< 5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version " < 5.4"	-	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	-	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	hotfix_1	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe
Siemens Search vendor "Siemens"	Sinamics Starter Firmware Search vendor "Siemens" for product "Sinamics Starter Firmware"	5.4 Search vendor "Siemens" for product "Sinamics Starter Firmware" and version "5.4"	hotfix_2	Affected	in	Siemens Search vendor "Siemens"	Sinamics Starter Search vendor "Siemens" for product "Sinamics Starter"	-	-	Safe