CVE-2019-19281
Description
A vulnerability has been identified in SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) (All versions >= V2.5 and < V20.8), SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions >= V2.5 and < V2.8), SIMATIC S7-1500 Software Controller (All versions >= V2.5 and < V20.8). Affected devices contain a vulnerability that allows an unauthenticated attacker to trigger a Denial-of-Service condition. The vulnerability can be triggered if specially crafted UDP packets are sent to the device. The security vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise the device availability.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Unauthenticated remote attacker can cause denial-of-service via crafted UDP packets on Siemens SIMATIC S7-1500 CPUs versions >=2.5 and <2.8 (or <20.8 for variants).
Vulnerability
The vulnerability (CWE-400 Resource Exhaustion) affects SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants) all versions >= V2.5 and < V20.8, SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) all versions >= V2.5 and < V2.8, and SIMATIC S7-1500 Software Controller all versions >= V2.5 and < V20.8. Specially crafted UDP packets can trigger a denial-of-service condition [1].
Exploitation
An unauthenticated attacker with network access can send specially crafted UDP packets to the device. No system privileges or user interaction are required [1].
Impact
Successful exploitation leads to a denial-of-service condition, compromising device availability. The CVSS v3 base score is 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) [1].
Mitigation
Siemens has released updates: for SIMATIC S7-1500 CPU family update to V2.8 or later; for ET 200SP Open Controller and Software Controller update to V20.8 or later. Workarounds include restricting network access to affected devices [1].
AI Insight generated on May 26, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
6- Range: >=2.5, <20.8
- Range: >=2.5, <20.8
- Range: >=2.5, <2.8
- Siemens AG/SIMATIC ET 200SP Open Controller CPU 1515SP PC2 (incl. SIPLUS variants)v5Range: All versions >= V2.5 and < V20.8
- Siemens AG/SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants)v5Range: All versions >= V2.5 and < V2.8
- Siemens AG/SIMATIC S7-1500 Software Controllerv5Range: All versions >= V2.5 and < V20.8
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
2- cert-portal.siemens.com/productcert/pdf/ssa-750824.pdfmitrex_refsource_MISC
- www.us-cert.gov/ics/advisories/icsa-20-042-11mitrex_refsource_MISC
News mentions
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