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Fencer Intel
high 7.5

CVE-2018-13805 json

A vulnerability has been identified in SIMATIC ET 200SP Open Controller (All versions >= V2.0 and < V2.1.6), SIMATIC S7-1500 Software Contr…

published 8y ago modified 4mo ago also EUVD-2018-5741

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.6%
EPSS 1.6% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC ET 200SP Open Controller (All versions >= V2.0 and < V2.1.6), SIMATIC S7-1500 Software Controller (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 incl. F (All versions >= V2.0 and < V2.5). An attacker can cause a denial-of-service condition on the network stack by sending a large number of specially crafted packets to the PLC. The PLC will lose its ability to communicate over the network. This vulnerability could be exploited by an attacker with network access to the affected systems. Successful exploitation requires no privileges and no user interaction. An attacker could use this vulnerability to compromise availability of the network connectivity. At the time of advisory publication no public exploitation of this vulnerability was known.

Patch / fix

  • siemens simatic_s7-1500_firmware 2.5
  • siemens simatic_s7-1500f_firmware 2.5

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-18-282-05 updated cvss 5.3

Siemens SIMATIC S7-1500, SIMATIC S7-1500 Software Controller and SIMATIC ET 200SP OpenController (Update A)

  • Siemens SIMATIC ET 200SP Open Controller (incl. SIPLUS variants) >=V2.0_and_<V2.1.6
    affected: fixed in V2.1.6, mitigation
  • Siemens SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants) >=V2.0_and_<V2.5 Siemens SIMATIC S7-1500 Software Controller >=V2.0_and_<V2.5
    affected: fixed in V2.5, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • Siemens AG SIMATIC ET 200SP Open Controller
  • Siemens AG SIMATIC S7-1500 Software Controller
  • Siemens AG SIMATIC S7-1500 incl. F

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.