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TI-2023-18360 Aliases CVE-2023-36521GHSA-g2ch-vrrq-vf7w

Resource allocation without limits in Siemens SIMATIC MV540 H

Priority MEDIUM 44CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00626 50th percentileScored 2026-11-07
Fix Fixed SIMATIC MV540 H (Siemens): V3.3.4SIMATIC MV540 S (Siemens): V3.3.4+4 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SiemensSIMATIC MV540 Hbefore V3.3.4V3.3.4Patch availableCNA
SiemensSIMATIC MV540 Sbefore V3.3.4V3.3.4Patch availableCNA
SiemensSIMATIC MV550 Hbefore V3.3.4V3.3.4Patch availableCNA
SiemensSIMATIC MV550 Sbefore V3.3.4V3.3.4Patch availableCNA
SiemensSIMATIC MV560 Ubefore V3.3.4V3.3.4Patch availableCNA
SiemensSIMATIC MV560 Xbefore V3.3.4V3.3.4Patch availableCNA
  • SIMATIC MV540 H VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA
  • SIMATIC MV540 S VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA
  • SIMATIC MV550 H VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA
  • SIMATIC MV550 S VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA
  • SIMATIC MV560 U VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA
  • SIMATIC MV560 X VendorSiemens Affected before V3.3.4 Fixed in V3.3.4 Patch available CNA

CPE configurations NVD · 12

CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_mv540_h_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv540_h:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_mv540_s_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv540_s:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_mv550_h_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv550_h:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_mv550_s_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv550_s:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_mv560_u_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv560_u:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:siemens:simatic_mv540_h_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv540_h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_mv540_s_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv540_s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_mv550_h_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv550_h:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_mv550_s_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv550_s:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_mv560_u_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv560_u:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Show 2 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_mv560_x_firmware:*:*:*:*:*:*:*:*before 3.3.4VulnerableSiemens
cpe:2.3:h:siemens:simatic_mv560_x:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:o:siemens:simatic_mv560_x_firmware:*:*:*:*:*:*:*:* Versions before 3.3.4 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_mv560_x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens

Remediation

  • Fix · CNA SIMATIC MV540 H (Siemens) Fixed in V3.3.4
  • Fix · CNA SIMATIC MV540 S (Siemens) Fixed in V3.3.4
  • Fix · CNA SIMATIC MV550 H (Siemens) Fixed in V3.3.4
  • Fix · CNA SIMATIC MV550 S (Siemens) Fixed in V3.3.4
  • Fix · CNA SIMATIC MV560 U (Siemens) Fixed in V3.3.4
  • Fix · CNA SIMATIC MV560 X (Siemens) Fixed in V3.3.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-36521
  2. 2026-10-03 Alias added: GHSA-g2ch-vrrq-vf7w
  3. 2026-10-30 EPSS moved to the 50th–90th percentile

References

Advisory 1

  • TI-2023-17985 Uncontrolled resource consumption in Siemens SIMATIC MV540 H CVSS 3.1HIGH 7.5
  • TI-2023-17984 Uncontrolled resource consumption in Siemens SIMATIC MV540 H CVSS 3.1HIGH 7.5
  • TI-2022-14578 Missing authentication in Siemens SIMATIC MV540 H CVSS 3.1HIGH 7.5
  • TI-2022-14577 Insufficient session expiration in Siemens SIMATIC MV540 H CVSS 3.1HIGH 8.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences