CVE-2024-49775 Siemens CVE debrief

Who should care

Organizations operating Siemens industrial automation infrastructure including manufacturing facilities with Opcenter MES deployments, process industries using SIMATIC PCS neo DCS, building automation systems with Desigo ABT, and engineering environments using TIA Portal. Critical infrastructure operators in energy, water, chemical, and pharmaceutical sectors with Siemens OT deployments. Security teams responsible for ICS/OT network segmentation and patch management in environments with UMC-integrated products.

Technical summary

CVE-2024-49775 is a heap-based buffer overflow vulnerability in Siemens' integrated User Management Component (UMC). The flaw exists in the UMC network service implementation and can be triggered by unauthenticated remote attackers. Successful exploitation results in arbitrary code execution with the privileges of the UMC service process. The vulnerability affects 12 distinct product lines spanning building automation (Desigo ABT), manufacturing execution (Opcenter suite), distributed control systems (SIMATIC PCS neo), network management (SINEC NMS), and engineering workstations (TIA Portal). The CVSS 3.1 vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates network attack vector, low attack complexity, no privileges required, no user interaction, and high impact across confidentiality, integrity, and availability. Network exposure of UMC service ports (4002, 4004) increases exploitation risk. Siemens has released patches for most affected products; SIMATIC PCS neo V4.0 and TIA Portal V16 have no planned fixes and require mitigation through network controls.

Defensive priority

critical

Recommended defensive actions

• Apply vendor-supplied updates for affected Siemens products: Opcenter RDnL to V2410+, Opcenter Execution Foundation to V2501.0001+, Opcenter Intelligence to V2501.0001+, Opcenter Quality to V2512+, SIMATIC PCS neo V4.1+U
• Update SIMATIC PCS neo V5.0 to Update 1 or later
• Update UMC component to V2.15.1.1 or later for SINEC NMS and TIA Portal V17-V19 installations
• Filter TCP ports 4002 and 4004 to restrict connections to authorized UMC network endpoints via external firewall
• Block port 4004 entirely if RT server machines are not deployed in the environment
• Prioritize patching for internet-facing or perimeter-connected industrial control systems
• Review network segmentation between IT and OT environments per CISA ICS recommended practices
• resourceLinkAnnotations

Evidence notes

The vulnerability affects 12 Siemens product lines across industrial automation, building automation, and manufacturing execution systems. The UMC component is integrated across diverse product families including SIMATIC PCS neo, SINEC NMS, TIA Portal, and Opcenter suite products. CISA's advisory ICSA-24-354-04 was republicated on January 14, 2026, incorporating Siemens' ProductCERT advisory SSA-928984. Multiple revision cycles indicate ongoing vendor remediation efforts spanning from initial disclosure through January 2026.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.