CVE-2023-50763Network attack vector

Authenticated web-server hang via incomplete certificate chain

Published Jun 11, 2024 · Updated Aug 2, 2024

Denial of service in Siemens SIMATIC and SIPLUS processors before 2.3 or 2.4.8 allows remote authenticated users to hang the web server. The configured PKCS12 import path processes an incomplete certificate chain without reaching a loop exit, leaving the web server in an infinite loop. Exploitation requires authenticated access and a configuration that permits PKCS12 container imports; the resulting impact is a web-server service hang.

CVSS severity4.9
Medium
EPSS probability0.39%
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 SIMATIC and SIPLUS processors before 2.3 or 2.4.8 allows remote authenticated users to hang the web server. The configured PKCS12 import path processes an incomplete certificate chain without reaching a loop exit, leaving the web server in an infinite loop. Exploitation requires authenticated access and a configuration that permits PKCS12 container imports; the resulting impact is a web-server service hang.

The record

CVE
CVE-2023-50763
Published
Jun 11, 2024
Updated
Aug 2, 2024
Vendor
Siemens
Product
SIMATIC CP 1542SP-1
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 11, 2024CVE 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

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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=0 <V2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC CP 1542SP-1version=0 <V2.3
Siemens · SIMATIC CP 1543SP-1version=0 <V2.3
Siemens · TIM 1531 IRCversion=0 <V2.4.8
Siemens · SIPLUS TIM 1531 IRCversion=0 <V2.4.8
Siemens · SIMATIC CP 1542SP-1 IRCversion=0 <V2.3
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 · SIPLUS ET 200SP CP 1542SP-1 IRC TX RAILversion=0 <V2.3

Published CVSS scores

4.9Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
6.9Siemens ProductCERTCVSS:4.0/AV:N/AC:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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