CVE-2023-38380Network attack vector

Webserver denial of service via unreleased memory

Published Dec 12, 2023 · Updated Aug 2, 2024

Missing memory release in Siemens SIMATIC and SINAMICS webservers allows remote attackers to exhaust memory and interrupt service. The integrated webserver fails to free allocated memory after use, so repeated requests consume the finite memory available to the device. Unauthenticated network access to the webserver is sufficient; exploitation interrupts the web service, with no reported data disclosure or modification.

CVSS severity7.5
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing memory release in Siemens SIMATIC and SINAMICS webservers allows remote attackers to exhaust memory and interrupt service. The integrated webserver fails to free allocated memory after use, so repeated requests consume the finite memory available to the device. Unauthenticated network access to the webserver is sufficient; exploitation interrupts the web service, with no reported data disclosure or modification.

The record

CVE
CVE-2023-38380
Published
Dec 12, 2023
Updated
Aug 2, 2024
Vendor
Siemens
Product
SINAMICS S210
Classifications
CWE-401, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=V6.1 <V6.1 HF2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SINAMICS S210version=V6.1 <V6.1 HF2
Siemens · SIMATIC CP 1543-1version=0 <V3.0.37
Siemens · SIMATIC CP 1243-1version=0 <V3.4.29
Siemens · SIMATIC CP 1542SP-1version=0 <V2.3
Siemens · SIMATIC CP 1543SP-1version=0 <V2.3
Siemens · SIMATIC CP 1242-7 V2version=0 <V3.4.29
Siemens · SIMATIC CP 1243-8 IRCversion=0 <V3.4.29
Siemens · SIPLUS NET CP 1543-1version=0 <V3.0.37
Siemens · SIMATIC CP 1542SP-1 IRCversion=0 <V2.3
Siemens · SIMATIC CP 1243-1 IECversion=0 <V3.4.29
Siemens · SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAILversion=0 <V2.3
Siemens · SIPLUS ET 200SP CP 1543SP-1 ISECversion=0 <V2.3
Siemens · SIMATIC CP 1243-7 LTEversion=0 <V3.4.29
Siemens · SIPLUS ET 200SP CP 1542SP-1 IRC TX RAILversion=0 <V2.3
Siemens · SIMATIC CP 1243-1 DNP3version=0 <*

Published CVSS scores

8.7Siemens ProductCERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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.

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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-401Missing Release of Memory after Effective Lifetime
T1499Endpoint 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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