CVE-2021-40360

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-02-09 · updated 2026-06-17
Weakness: CWE-200

Description

A vulnerability has been identified in SIMATIC PCS 7 V8.2 (All versions), SIMATIC PCS 7 V9.0 (All versions), 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 6). The password hash of a local user account in the remote server could be granted via public API to a user on the affected system. An authenticated attacker could brute force the password hash and use it to login to the server.

Affected products

Siemens SIMATIC PCS 7: through 8.2; 9.0, 9.1
Siemens Simatic Wincc: before 7.4; 7.4, 7.4-sp1, 7.4-sp1_update1, 7.4-sp1_update10, 7.4-sp1_update11, 7.4-sp1_update12 (+43) — fixed in 7.4

How to fix

Upgrade to a fixed version: Siemens Simatic Wincc 7.4. Check the vendor advisory for mitigations.

References

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