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Fencer Vulns
high 7.5

CVE-2019-18336 json

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl.

published 2020-03-10 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-8125

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V3.X.17), SIMATIC TDC CP51M1 (All versions < V1.1.8), SIMATIC TDC CPU555 (All versions < V1.1.1), SINUMERIK 840D sl (All versions < V4.8.6), SINUMERIK 840D sl (All versions < V4.94). Specially crafted packets sent to port 102/tcp (Profinet) could cause the affected device to go into defect mode. A restart is required in order to recover the system. Successful exploitation requires an attacker to have network access to port 102/tcp, with no authentication. No user interation is required. At the time of advisory publication no public exploitation of this security vulnerability was known.

Patch / fix

  • siemens sinumerik_840d_sl 4.8.6, 4.94
  • siemens simatic_s7-300_cpu_firmware 3.3.17
  • siemens simatic_s7-300_cpu_312_ifm_firmware 3.3.17
  • siemens simatic_s7-300_cpu_313_firmware 3.3.17
  • siemens simatic_s7-300_cpu_314_firmware 3.3.17
  • siemens simatic_s7-300_cpu_314_ifm_firmware 3.3.17
  • siemens simatic_s7-300_cpu_315_firmware 3.3.17
  • siemens simatic_s7-300_cpu_315-2_dp_firmware 3.3.17
  • siemens simatic_s7-300_cpu_316-2_dp_firmware 3.3.17
  • siemens simatic_s7-300_cpu_318-2_firmware 3.3.17
  • siemens simatic_tdc_cp51m1_firmware 1.1.8
  • siemens simatic_tdc_cpu555_firmware 1.1.1

Vendor advisories

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

cisa ICSA-20-070-02 updated cvss 7.5

Siemens SIMATIC S7-300 CPUs and SINUMERIK Controller over Profinet (Update A)

  • Siemens SIMATIC S7-300 CPU family (incl.'related ET200 CPUs and SIPLUS variants) <V3.X.17
    affected: fixed in V3.X.17, mitigation
  • Siemens SIMATIC TDC CP51M1 <V1.1.8
    affected: fixed in V1.1.8, mitigation
  • Siemens SIMATIC TDC CPU555 <V1.1.1
    affected: fixed in V1.1.1, mitigation
  • Siemens SINUMERIK 840D sl <V4.8.6, <V4.94
    affected: fixed in V4.8.6, mitigation

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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

1.72% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Siemens AG SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants)
  • Siemens AG SIMATIC TDC CP51M1
  • Siemens AG SIMATIC TDC CPU555
  • Siemens AG SINUMERIK 840D sl

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns 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.