What is the CVSS score of CVE-2021-40364?

CVE-2021-40364 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.2%.

Simatic Pcs 7 CVE-2021-40364

MEDIUM

Insertion of Sensitive Information into Log File (CWE-532)

2021-11-09 productcert@siemens.com

Information Disclosure Siemens Simatic Wincc Simatic Pcs 7

5.5

CVSS 3.1 · Vendor: siemens

View

Vulnerability Assessment

Weakness	CWE CWE-532 OWASP Top 10:2025 A09:2025 - Security Logging & Alerting Failures ASVS 5.0 V16 - Security Logging and Error Handling Log data sanitization
Impact	CVSS score of 5.5 (MEDIUM). Attack characteristics: local attack vector, low complexity, low privileges required, no user interaction not required.
Exploit ScenarioDerived	Successful exploitation could compromise the medium-severity affected system.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.2% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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 under CWE-532. 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). The affected systems store sensitive information in log files. An attacker with access to the log files could publicly expose the information or reuse it to develop further attacks on the system. Affected products include: Siemens Simatic Pcs 7, Siemens Simatic Wincc.

Know when Simatic Pcs 7 gets its next vulnerability

Watch products and get an email when something new is published
Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (siemens) PRIMARY 5.5 MEDIUM

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

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

CVSS VectorVendor: siemens

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

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). The affected systems store sensitive information in log files. An attacker with access to the log files could publicly expose the information or reuse it to develop further attacks on the system.

Threat Intelligence Overview

EPSS Score

0.2%

Top 86% 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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.2%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

Defer

Exploitation· derived

None

System Exposure· derived

Small

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +28

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:siemens:simatic_pcs_7:*:*:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_pcs_7:9.1:-:*:*:*:*:*:*

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:sp1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp1_update2:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp2:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update1:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update2:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update3:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:7.5:sp2_update4:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:15:*:*:*:*:*:*:*

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

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

cpe:2.3:a:siemens:simatic_wincc:16:update2:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:16:update3:*:*:*:*:*:*

cpe:2.3:a:siemens:simatic_wincc:16:update4:*:*:*:*:*:*

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

+ 1 more

More in Simatic Pcs 7

View all

CVE-2014-8551 CRITICAL Act Now

10.0 Nov 26

The WinCC server in Siemens SIMATIC WinCC 7.0 through SP3, 7.2 before Update 9, and 7.3 before Update 2; SIMATIC PCS 7 7

CVE-2021-40358 CRITICAL Act Now

9.9 Nov 09

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC

CVE-2019-10922 CRITICAL Act Now

9.8 May 14

A vulnerability has been identified in SIMATIC PCS 7 V8.0 and earlier (All versions), SIMATIC PCS 7 V8.1 and newer (All

CVE-2023-28829 HIGH This Week

8.8 Jun 13

A vulnerability has been identified in SIMATIC NET PC Software V14 (All versions), SIMATIC NET PC Software V15 (All vers

CVE-2023-25910 HIGH This Week

8.8 Jun 13

A vulnerability has been identified in SIMATIC PCS 7 (All versions < V9.1 SP2 UC04), SIMATIC S7-PM (All versions < V5.7

CVE-2019-10918 HIGH This Week

8.8 May 14

A vulnerability has been identified in SIMATIC PCS 7 V8.0 and earlier (All versions), SIMATIC PCS 7 V8.1 (All versions <

CVE-2019-10916 HIGH This Week

8.8 May 14

A vulnerability has been identified in SIMATIC PCS 7 V8.0 and earlier (All versions), SIMATIC PCS 7 V8.1 (All versions <

CVE-2016-9160 HIGH This Week

8.1 Dec 17

A vulnerability in SIEMENS SIMATIC WinCC (All versions < SIMATIC WinCC V7.2) and SIEMENS SIMATIC PCS 7 (All versions < S

CVE-2022-24287 HIGH This Week

7.8 May 20

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3 UC

CVE-2020-7586 HIGH This Week

7.8 Jun 10

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions <

CVE-2020-7585 HIGH This Week

7.8 Jun 10

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions <

CVE-2018-4832 HIGH This Week

7.5 Apr 24

A vulnerability has been identified in OpenPCS 7 V7.1 and earlier (All versions), OpenPCS 7 V8.0 (All versions), OpenPCS

Same weakness CWE-532 – Insertion of Sensitive Information into Log File

View all

CVE-2023-43261 HIGH POC

7.5

CVE-2025-24984 MEDIUM

4.6

CVE-2017-8075 CRITICAL POC

9.8

CVE-2017-8074 CRITICAL POC

9.8

CVE-2026-22778 CRITICAL POC

9.8

CVE-2019-17395 CRITICAL POC

9.8

CVE-2019-17398 CRITICAL POC

9.8

CVE-2019-17394 CRITICAL POC

9.8

Same technique Information Disclosure

View all

CVE-2019-2725 CRITICAL POC

9.8

CVE-2021-34523 CRITICAL POC

9.0

CVE-2013-2251 CRITICAL POC

9.8

CVE-2017-5638 CRITICAL POC

9.8

CVE-2025-24813 CRITICAL POC

9.8

CVE-2025-68613 HIGH POC

8.8

CVE-2015-1701 HIGH POC

7.8

CVE-2017-0147 HIGH POC

7.5

References

Advisories & patches

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

Search Externally

GitHub PoC

Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC

Back