CVE-2023-30755Network attack vector

Service crash via mishandled shutdown or reboot

Published Sep 10, 2024 · Updated Sep 10, 2024

NULL pointer dereference in Siemens SIMATIC web servers allows remote authenticated users to cause a service crash via shutdown or reboot requests. The shutdown/reboot handler cleans up resources incorrectly, causing a NULL pointer dereference that interrupts the web server. Access to the web server with elevated privileges is required, and the documented consequence is availability loss rather than data access or modification.

CVSS severity5.9
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Siemens SIMATIC web servers allows remote authenticated users to cause a service crash via shutdown or reboot requests. The shutdown/reboot handler cleans up resources incorrectly, causing a NULL pointer dereference that interrupts the web server. Access to the web server with elevated privileges is required, and the documented consequence is availability loss rather than data access or modification.

The record

CVE
CVE-2023-30755
Published
Sep 10, 2024
Updated
Sep 10, 2024
Vendor
Siemens
Product
SIMATIC WinCC Runtime Advanced
Classifications
CWE-476, T0814
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 10, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Siemens · SIMATIC WinCC Runtime Advancedversion=All versions
Siemens · SIMATIC CP 1243-1version=0 <V3.5.20
Siemens · TIM 1531 IRCversion=0 <V2.4.8
Siemens · SIMATIC CP 1242-7 V2version=0 <V3.5.20
Siemens · SIPLUS TIM 1531 IRCversion=0 <V2.4.8
Siemens · SIMATIC CP 1243-8 IRCversion=0 <V3.5.20
Siemens · SIMATIC IPC DiagMonitorversion=All versions
Siemens · SIMATIC IPC DiagBaseversion=0 <*
Siemens · SIMATIC HMI Comfort Panelsversion=All versions
Siemens · SIMATIC CP 1243-1 IECversion=0 <V3.5.20
Siemens · SIMATIC CP 1243-7 LTEversion=0 <V3.5.20
Siemens · SIMATIC CP 1243-1 DNP3version=0 <V3.5.20

Published CVSS scores

4.4Siemens ProductCERTCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C
5.9Siemens ProductCERTCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T0814Denial 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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