Siemens SIMATIC Et 200sp Im 155-6 pn/3 Hf vulnerabilities

3 CVEs affecting Siemens SIMATIC Et 200sp Im 155-6 pn/3 Hf, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2025-40944, published 2026-01-13.

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Known exploited (CISA KEV) first, then by EPSS exploit probability.

• CVE-2024-23814, published 2025-02-11. Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days. The integrated ICMP service of the network stack of affected devices can be forced to exhaust its available memory resources when receiving specially crafted messages targeting IP fragment…
• CVE-2025-40820, published 2025-12-09. High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days. Affected products do not properly enforce TCP sequence number validation in specific scenarios but accept values within a broad range. This could allow an unauthenticated remote attacker e.g. to…
• CVE-2025-40944, published 2026-01-13. High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days. A vulnerability has been identified in SIMATIC ET 200AL IM 157-1 PN (6ES7157-1AB00-0AB0) (All versions), SIMATIC ET 200MP IM 155-5 PN HF (6ES7155-5AA00-0AC0) (All versions >= V4.2.0), SIMATIC ET…