CVE Tools
Sign in

CVE-2023-27336

Published: May 3, 2024Updated: Aug 13, 2025 Sources: CVE List NVD BDUCWE-476
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.8%
Top 49.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Softing edgeConnector Siemens OPC UA Server Null Pointer Dereference Denial-of-Service Vulnerability. This vulnerability allows remote attackers to create a denial-of-service condition on affected installations of Softing edgeConnector Siemens. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OPC client certificates. The issue results from dereferencing a NULL pointer. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-20508.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-476

Affected Products

edgeConnector SiemensSoftingICS / OT / IoT
edgeaggregatorsoftingICS / OT / IoT
edgeconnectorsoftingICS / OT / IoT
secure integration serversoftingICS / OT / IoT
Softing edgeConnector SiemensSofting Industrial Automation GmbH
Embedded
ICS / OT / IoT / industrial-network
softingcommercialDEICS / OT / IoT
softing industrial automation gmbhcommercialDEICS / OT / IoTaka softing industrial automation

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://www.zerodayinitiative.com/advisories/ZDI-23-1065/
zerodayinitiative.com

Timeline

Published
May 3, 2024
Last Updated
Aug 13, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2023-27336 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows