What’s Vulnerable › Vulnerabilities
CVE-2011-20001
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-10-14 · updated 2026-06-16
- Weakness: CWE-20
Description
A vulnerability has been identified in SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) (All versions < V2.0.3), SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) (All versions < V2.0.3). The web server interface of affected devices improperly processes incoming malformed HTTP traffic at high rate. This could allow an unauthenticated remote attacker to force the device entering the stop/defect state, thus creating a denial of service condition.
Affected products
- Siemens SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants): before V2.0.3 — fixed in V2.0.3
- Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants): before V2.0.3 — fixed in V2.0.3
How to fix
Upgrade to a fixed version: Siemens SIMATIC S7-1200 CPU V1 family (incl. SIPLUS variants) V2.0.3; Siemens SIMATIC S7-1200 CPU V2 family (incl. SIPLUS variants) V2.0.3. Check the vendor advisory for mitigations.
References
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