CVE-2021-40364

What it is

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.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-11-09 12:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 5.5 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-11-09 12:15 UTC

Last modified

2026-06-17 04:06 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-532 · Secrets in logs

Record status

Modified

Affected

• Siemens Simatic Pcs 7 ≤ 8.2
• Siemens Simatic Pcs 7 < 9.1
• Siemens Simatic Pcs 7 9.1
• Siemens Simatic Wincc ≤ 7.4
• Siemens Simatic Wincc 7.5
• Siemens Simatic Wincc 15
• Siemens Simatic Wincc 16
• Siemens Simatic Wincc 17

Attack profile CVSS 3.1 · 5.5

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-40364.md and follow it. Check whether this project is affected by CVE-2021-40364. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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