CVE-2019-19301Network attack vector

Service interruption via unbounded per-packet processing

Published Apr 14, 2020 · Updated Aug 5, 2024

Resource exhaustion in Siemens SCALANCE and SIMATIC devices allows remote attackers to interrupt service through crafted TCP packets. The VxWorks-based PROFINET TCP stack performs computation-expensive calls for every incoming packet instead of bounding per-packet processing. Unauthenticated network access is sufficient; repeated packets consume processing capacity without reported data exposure or modification.

CVSS severity7.5
High
EPSS probability1.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Siemens SCALANCE and SIMATIC devices allows remote attackers to interrupt service through crafted TCP packets. The VxWorks-based PROFINET TCP stack performs computation-expensive calls for every incoming packet instead of bounding per-packet processing. Unauthenticated network access is sufficient; repeated packets consume processing capacity without reported data exposure or modification.

The record

CVE
CVE-2019-19301
Published
Apr 14, 2020
Updated
Aug 5, 2024
Vendor
Siemens
Product
SCALANCE X307-2 EEC (2x 230V)
Classifications
CWE-400, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All versions < V4.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE X307-2 EEC (2x 230V)version=All versions < V4.1.4
Siemens · SCALANCE X212-2LDversion=All versions < V5.2.5
Siemens · SCALANCE X204IRT PROversion=All versions < V5.5.0
Siemens · SCALANCE X308-2Mversion=All versions < V4.1.4
Siemens · SCALANCE XR324-4M PoE (230V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X202-2P IRTversion=All versions < V5.5.0
Siemens · SCALANCE X204-2FMversion=All versions < V5.2.5
Siemens · SCALANCE XR324-12M (24V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X307-3LDversion=All versions < V4.1.4
Siemens · SCALANCE X302-7 EEC (24V)version=All versions < V4.1.4
Siemens · SCALANCE XF204-2version=All versions < V5.2.5
Siemens · SCALANCE XR324-4M PoE (24V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE XR324-4M EEC (2x 24V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X320-1 FEversion=All versions < V4.1.4
Siemens · SCALANCE X204-2TSversion=All versions < V5.2.5
Siemens · SCALANCE X302-7 EEC (2x 230V, coated)version=All versions < V4.1.4
Siemens · SCALANCE X204-2version=All versions < V5.2.5
Siemens · SCALANCE XR324-12M (230V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X310FEversion=All versions < V4.1.4
Siemens · SCALANCE X307-2 EEC (2x 24V)version=All versions < V4.1.4
Siemens · SCALANCE XR324-4M EEC (24V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE XR324-12M (24V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X206-1version=All versions < V5.2.5
Siemens · SIMATIC RF180Cversion=All versions
Siemens · SCALANCE X204-2LDversion=All versions < V5.2.5
Siemens · SCALANCE XR324-4M PoE (24V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE XF204IRTversion=All versions < V5.5.0
Siemens · SCALANCE X302-7 EEC (2x 24V)version=All versions < V4.1.4
Siemens · SCALANCE X206-1LDversion=All versions < V5.2.5
Siemens · SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X202-2P IRT PROversion=All versions < V5.5.0
Siemens · SCALANCE X307-2 EEC (24V, coated)version=All versions < V4.1.4
Siemens · SCALANCE X204-2LD TSversion=All versions < V5.2.5
Siemens · SCALANCE X310version=All versions < V4.1.4
Siemens · SIPLUS NET CP 443-1version=All versions < V3.3
Siemens · SCALANCE X204IRTversion=All versions < V5.5.0
Siemens · SCALANCE X202-2IRTversion=All versions < V5.5.0
Siemens · SCALANCE X216version=All versions < V5.2.5
Siemens · SCALANCE X302-7 EEC (230V)version=All versions < V4.1.4
Siemens · SCALANCE XF202-2P IRTversion=All versions < V5.5.0
Siemens · SCALANCE X208PROversion=All versions < V5.2.5
Siemens · SCALANCE X308-2version=All versions < V4.1.4
Siemens · SCALANCE XR324-12M TS (24V)version=All versions < V4.1.4
Siemens · SCALANCE X302-7 EEC (2x 24V, coated)version=All versions < V4.1.4
Siemens · SCALANCE XR324-4M PoE (230V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X224version=All versions < V5.2.5
Siemens · SIMATIC CP 343-1 Advancedversion=All versions
Siemens · SCALANCE X302-7 EEC (230V, coated)version=All versions < V4.1.4
Siemens · SIMATIC RF182Cversion=All versions
Siemens · SCALANCE X208version=All versions < V5.2.5
Siemens · SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on rear)version=All versions < V4.1.4
Siemens · SIPLUS NET CP 343-1 Advancedversion=All versions
Siemens · SCALANCE XR324-4M EEC (24V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X201-3P IRT PROversion=All versions < V5.5.0
Siemens · SCALANCE X302-7 EEC (24V, coated)version=All versions < V4.1.4
Siemens · SCALANCE X307-3version=All versions < V4.1.4
Siemens · SCALANCE X307-2 EEC (24V)version=All versions < V4.1.4
Siemens · SCALANCE X308-2LH+version=All versions < V4.1.4
Siemens · SCALANCE X308-2M PoEversion=All versions < V4.1.4
Siemens · SCALANCE X307-2 EEC (230V, coated)version=All versions < V4.1.4
Siemens · SCALANCE XF201-3P IRTversion=All versions < V5.5.0
Siemens · SIMATIC CP 443-1version=All versions < V3.3
Siemens · SCALANCE XR324-4M EEC (2x 24V, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X302-7 EEC (2x 230V)version=All versions < V4.1.4
Siemens · SCALANCE XF208version=All versions < V5.2.5
Siemens · SCALANCE XF204-2BA IRTversion=All versions < V5.5.0
Siemens · SIPLUS NET CP 443-1 Advancedversion=All versions < V3.3
Siemens · SCALANCE XF204version=All versions < V5.2.5
Siemens · SCALANCE X308-2M TSversion=All versions < V4.1.4
Siemens · SIMATIC CP 443-1 Advancedversion=All versions < V3.3
Siemens · SCALANCE X307-2 EEC (230V)version=All versions < V4.1.4
Siemens · SCALANCE XR324-4M EEC (100-240VAC/60-250VDC, ports on rear)version=All versions < V4.1.4
Siemens · SCALANCE X307-2 EEC (2x 230V, coated)version=All versions < V4.1.4
Siemens · SCALANCE XR324-4M EEC (2x 100-240VAC/60-250VDC, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X306-1LD FEversion=All versions < V4.1.4
Siemens · SCALANCE XR324-12M (230V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X304-2FEversion=All versions < V4.1.4
Siemens · SCALANCE X308-2LDversion=All versions < V4.1.4
Siemens · SCALANCE X307-2 EEC (2x 24V, coated)version=All versions < V4.1.4
Siemens · SCALANCE X201-3P IRTversion=All versions < V5.5.0
Siemens · SCALANCE X320-1-2LD FEversion=All versions < V4.1.4
Siemens · SIMATIC CP 442-1 RNAversion=All versions < V1.5.18
Siemens · SCALANCE X408-2version=All versions < V4.1.4
Siemens · SCALANCE XF206-1version=All versions < V5.2.5
Siemens · SCALANCE XR324-4M PoE TS (24V, ports on front)version=All versions < V4.1.4
Siemens · SCALANCE X200-4P IRTversion=All versions < V5.5.0
Siemens · SCALANCE X212-2version=All versions < V5.2.5
Siemens · SIMATIC CP 443-1 RNAversion=All versions < V1.5.18
Siemens · SIPLUS NET SCALANCE X308-2version=All versions < V4.1.4

Published CVSS scores

7.5Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.002Service Exhaustion

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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