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Simatic Pcs 7 CVE-2021-40358

CRITICAL
Path Traversal (CWE-22)
2021-11-09 productcert@siemens.com
Path Traversal Siemens Simatic Wincc Simatic Pcs 7
9.9
CVSS 3.1 · Vendor: siemens
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Vulnerability Assessment

Weakness
CWE
CWE-22
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V5 - File Handling Path canonicalization, traversal prevention
MITRE ATT&CK

2 techniques across 2 tactics: Discovery, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Impact

CVSS score of 9.9 (CRITICAL). Attack characteristics: network attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived

A remote attacker could access files and directories outside the intended path by sending crafted requests to the affected application.
Act Now Prioritize within 24-48h. Why: CRITICAL severity.
No patch listed yet 1.2% exploitation probability (EPSS)

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AnalysisAI

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and. Rated critical severity (CVSS 9.9), this vulnerability is remotely exploitable, low attack complexity. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Validate and canonicalize file paths. Use chroot or sandboxing. Reject input containing path separators or '../' sequences.

Affects your stack

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Technical ContextAI · show details

This vulnerability is classified as Path Traversal (CWE-22), which allows attackers to access files and directories outside the intended path. A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). Legitimate file operations on the web server of the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read, write or delete unexpected critical files. Affected products include: Siemens Simatic Pcs 7, Siemens Simatic Wincc.

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Severity by source

Vendor (siemens) PRIMARY 9.9 CRITICAL
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Primary rating from Vendor (siemens) · only source for this CVE.

CVSS VectorVendor: siemens

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC04), SIMATIC PCS 7 V9.1 (All versions < V9.1 SP1), SIMATIC WinCC V15 and earlier (All versions < V15 SP1 Update 7), SIMATIC WinCC V16 (All versions < V16 Update 5), SIMATIC WinCC V17 (All versions < V17 Update 2), SIMATIC WinCC V7.4 (All versions < V7.4 SP1 Update 19), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 5). Legitimate file operations on the web server of the affected systems do not properly neutralize special elements within the pathname. An attacker could then cause the pathname to resolve to a location outside of the restricted directory on the server and read, write or delete unexpected critical files.

Threat Intelligence Overview

EPSS Score
1.2%
Top 34% exploitable
Data Quality
2 sources
Confidence: Low
NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 1.2%
Patch available No
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact· derived
Medium

Priority Score

51
Low Medium High Critical
KEV: 0
EPSS: +1
CVSS: +50
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Affected Products (CPE)CVE.org

cpe:2.3:a:siemens:simatic_pcs_7:8.2:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_7:9.0:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_pcs_7:9.1:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:*:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:-:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update1:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update10:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update11:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update12:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update13:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update14:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update15:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update16:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update17:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update18:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update2:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update3:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update4:*:*:*:*:*:*
cpe:2.3:a:siemens:simatic_wincc:7.4:sp1_update5:*:*:*:*:*:*
+ 28 more

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Same weakness CWE-22 – Path Traversal

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CVE-2019-3396 CRITICAL POC
9.8
CVE-2019-19781 CRITICAL POC
9.8
CVE-2020-5902 CRITICAL POC
9.8
CVE-2021-21972 CRITICAL POC
9.8
CVE-2021-40444 HIGH POC
8.8
CVE-2022-41352 CRITICAL POC
9.8
CVE-2021-27065 HIGH POC
7.8
CVE-2019-11510 CRITICAL POC
10.0

Same technique Path Traversal

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CVE-2018-20250 HIGH POC
7.8
CVE-2022-37042 CRITICAL POC
9.8
CVE-2025-64446 CRITICAL POC
9.8

References

Advisories & patches
ADVISORY https://cert-portal.siemens.com/productcert/pdf/ssa-840188.pdf

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