CVE-2022-33138

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-07-12 · updated 2026-06-17
Weakness: CWE-306

Description

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3), SIMATIC MV540 S (All versions < V3.3), SIMATIC MV550 H (All versions < V3.3), SIMATIC MV550 S (All versions < V3.3), SIMATIC MV560 U (All versions < V3.3), SIMATIC MV560 X (All versions < V3.3). Affected devices do not perform authentication for several web API endpoints. This could allow an unauthenticated remote attacker to read and download data from the device.

Affected products

Siemens Simatic Mv540 H Firmware: before 3.3 — fixed in 3.3
Siemens Simatic Mv540 S Firmware: before 3.3 — fixed in 3.3
Siemens Simatic Mv550 H Firmware: before 3.3 — fixed in 3.3
Siemens Simatic Mv550 S Firmware: before 3.3 — fixed in 3.3
Siemens Simatic Mv560 U Firmware: before 3.3 — fixed in 3.3
Siemens Simatic Mv560 X Firmware: before 3.3 — fixed in 3.3

How to fix

Upgrade to a fixed version: Siemens Simatic Mv540 H Firmware 3.3; Siemens Simatic Mv540 S Firmware 3.3; Siemens Simatic Mv550 H Firmware 3.3; Siemens Simatic Mv550 S Firmware 3.3; Siemens Simatic Mv560 U Firmware 3.3; Siemens Simatic Mv560 X Firmware 3.3. Check the vendor advisory for mitigations.

References

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