No exploitation reportedFix available

CVE-2019-18336

Q: Is CVE-2019-18336 actively exploited?

Active exploitation of CVE-2019-18336 has not been confirmed. Its EPSS score was 1.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2019-18336?

CVE-2019-18336 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2020-03-10
Fixed in4.94 · 4.8.6
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2020-03-1020:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-18336?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-18336?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens sinumerik 840d sl

Branch	Affected	Fixed in	Source
4.94	< 4.94	4.94	NVD
4.8	< 4.8.6	4.8.6	NVD

Siemens simatic s7-300 cpu 312 ifm firmwareversion to verify

Branch	Affected	Fixed in	Source
3.3	< 3.3.17	3.3.17	NVD

Siemens simatic s7-300 cpu 313 firmwareversion to verify

Branch	Affected	Fixed in	Source
3.3	< 3.3.17	3.3.17	NVD

9 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-20-070-02 CISA5 known affected
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): All versions < V3.X.17 · Siemens SIMATIC TDC CP51M1: All versions < V1.1.8 · Siemens SIMATIC TDC CPU555: All versions < V1.1.1 · +2 more

Full record on NVD

Fix

Update Siemens sinumerik 840d sl to 4.94 · 4.8.6
Vendor fix CISA ICSA-20-070-02 · 1 productUpdate to V3.X.17
Vendor fix CISA ICSA-20-070-02 · 1 productUpdate to V1.1.8
Vendor fix CISA ICSA-20-070-02 · 1 productUpdate to V1.1.1
Vendor fix CISA ICSA-20-070-02 · 1 productUpdate to V4.8.6
Vendor fix CISA ICSA-20-070-02 · 1 productUpdate to V4.94
Mitigation from the vendor CISA ICSA-20-070-02 · 5 productsMake sure that access to port 102/tcp is restricted e.g.'with an external firewall.

Advisories and patches

cert-portal.siemens.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-06-02
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52026-06-02
NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
CNAweakness (CWE)CWE-400read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score1.7 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2020-03-10
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2019-18336?

Is CVE-2019-18336 actively exploited?

Active exploitation of CVE-2019-18336 has not been confirmed. Its EPSS score was 1.7% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-18336?

CVE-2019-18336 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running SIMATIC S7-300 CPU family (incl? Hear about its next vulnerability

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