CVE Tools
Sign in

CVE-2021-31893

Published: Jul 13, 2021Updated: Nov 21, 2024 Sources: CVE List NVD csafCWE-120
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.6%
Top 57.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-120

Affected Products

simatic pcs firmwaresiemensICS / OT / IoT
simatic pdm firmwaresiemensICS / OT / IoT
simatic step 7 firmwaresiemensICS / OT / IoT
sinamics starter firmwaresiemensICS / OT / IoT
SIMATIC PCS 7 V8.2 and earlierSiemensICS / OT / IoT
siemenscommercialDEEnterprise Softwareaka siemens ag
and 4 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/csaf/ssa-641963.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/txt/ssa-641963.txt
cert-portal.siemens.com
and 12 more references View all →

Timeline

Published
Jul 13, 2021
Last Updated
Nov 21, 2024

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-31893 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows