CVE-2023-36521

HIGH

7.5

CVSS Score

Published: July 11, 2023 at 09:07 AM UTC

Updated: October 23, 2026 at 11:10 PM UTC

12 products affected across 1 vendorSIMATIC MV560 U FirmwareSIMATIC MV540 H FirmwareSIMATIC MV540 S Firmware· also runs on 6 platforms

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

A vulnerability has been identified in SIMATIC MV540 H (All versions < V3.3.4), SIMATIC MV540 S (All versions < V3.3.4), SIMATIC MV550 H (All versions < V3.3.4), SIMATIC MV550 S (All versions < V3.3.4), SIMATIC MV560 U (All versions < V3.3.4), SIMATIC MV560 X (All versions < V3.3.4). The result synchronization server of the affected products contains a vulnerability that may lead to a denial of service condition. An attacker may cause a denial of service situation of all socket-based communication of the affected products if the result server is enabled.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

SIMATIC MV540 H Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV540 S Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV550 H Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV550 S Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV560 U Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV560 X Firmware · Siemens

95%

v < 3.3.4All versions < V3.3.4

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

Simatic Mv540 H · Siemensdevice

80%

All versions

Simatic Mv540 S · Siemensdevice

80%

All versions

Simatic Mv550 H · Siemensdevice

80%

All versions

Simatic Mv550 S · Siemensdevice

80%

All versions

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

SIMATIC MV540 H Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV540 S Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV550 H Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV550 S Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV560 U Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

SIMATIC MV560 X Firmware · Siemens

95%

Affected range stops below 3.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below V3.3.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf

References (1)

Vendor Advisory

Source: [email protected]

https://cert-portal.siemens.com/productcert/pdf/ssa-561322.pdf

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-770

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