CVE-2019-13926Network attack vector

Unauthenticated web-server DoS via crafted HTTPS packets

Published Feb 11, 2020 · Updated Aug 5, 2024

Denial-of-Service in Siemens SCALANCE S602 firmware 3.0 through before 4.1 allows remote attackers to interrupt the web server via crafted TCP/443 packets. The same packet-triggered condition affects SCALANCE S612, S623 and S627-2M in the stated firmware range, consuming web-server resources until service failure. Exploitation requires network access to the HTTPS interface and no authentication or user interaction; restoring service requires a cold reboot, with impact limited to web-server availability.

CVSS severity7.5
High
EPSS probability1.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial-of-Service in Siemens SCALANCE S602 firmware 3.0 through before 4.1 allows remote attackers to interrupt the web server via crafted TCP/443 packets. The same packet-triggered condition affects SCALANCE S612, S623 and S627-2M in the stated firmware range, consuming web-server resources until service failure. Exploitation requires network access to the HTTPS interface and no authentication or user interaction; restoring service requires a cold reboot, with impact limited to web-server availability.

The record

CVE
CVE-2019-13926
Published
Feb 11, 2020
Updated
Aug 5, 2024
Vendor
Siemens
Product
SCALANCE S602
Classifications
CWE-400, T1499.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 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

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Is a vulnerable build present?

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

  1. Affected versionversion=All versions >= V3.0 and < V4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE S602version=All versions >= V3.0 and < V4.1
Siemens · SCALANCE S612version=All versions >= V3.0 and < V4.1
Siemens · SCALANCE S623version=All versions >= V3.0 and < V4.1
Siemens · SCALANCE S627-2Mversion=All versions >= V3.0 and < V4.1

Published CVSS scores

7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NVDAV:N/AC:L/Au:N/C:N/I:N/A:C

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
T1499.002Network Denial of Service

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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