What is the CVSS score of CVE-2021-40359?

CVE-2021-40359 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 1.1%.

Simatic Batch CVE-2021-40359

HIGH

Path Traversal (CWE-22)

2021-11-09 productcert@siemens.com

Path Traversal Siemens Simatic Wincc Simatic Batch Simatic Net Pc Simatic Route Control Simaticpcs 7

7.7

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. Sign in to read
Impact	CVSS score of 7.7 (HIGH). 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.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 1.1% exploitation probability (EPSS)

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AnalysisAI

A vulnerability has been identified in OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0. Rated high severity (CVSS 7.7), 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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Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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 OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0 (All versions), SIMATIC BATCH V9.1 (All versions), SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All versions), SIMATIC NET PC Software V16 (All versions < V16 Update 6), SIMATIC NET PC Software V17 (All versions < V17 SP1), 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 Route Control V8.2 (All versions), SIMATIC Route Control V9.0 (All versions), SIMATIC Route Control V9.1 (All versions), 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). When downloading files, 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 unexpected critical files. Affected products include: Siemens Simatic Batch, Siemens Simatic Net Pc, Siemens Simatic Route Control, Siemens Simatic Wincc, Siemens Simaticpcs 7.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (siemens) PRIMARY 7.7 HIGH

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

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

None

Availability

None

DescriptionCVE.org

A vulnerability has been identified in OpenPCS 7 V8.2 (All versions), OpenPCS 7 V9.0 (All versions < V9.0 Upd4), OpenPCS 7 V9.1 (All versions), SIMATIC BATCH V8.2 (All versions), SIMATIC BATCH V9.0 (All versions), SIMATIC BATCH V9.1 (All versions), SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All versions), SIMATIC NET PC Software V16 (All versions < V16 Update 6), SIMATIC NET PC Software V17 (All versions < V17 SP1), 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 Route Control V8.2 (All versions), SIMATIC Route Control V9.0 (All versions), SIMATIC Route Control V9.1 (All versions), 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). When downloading files, 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 unexpected critical files.

Threat Intelligence Overview

EPSS Score

1.1%

Top 37% 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 HIGH

CISA KEV No

Public POC No

EPSS 1.1%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

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

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +38

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_batch:8.2:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:8.2:upd_9:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:sp1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_2:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_3:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.0:sp1_update_4:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_batch:9.1:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_net_pc:14:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_net_pc:15:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_net_pc:16:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_net_pc:16:update1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_net_pc:17:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_route_control:8.2:*:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_route_control:9.0:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_route_control:9.1:-:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:*:*:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:*:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:-:*:*:*:*:*:*

+ 19 more

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References

Advisories & patches

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

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GitHub PoC

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