CVE-2023-27336Network attack vector

Service crash via invalid OPC client certificate

Published May 3, 2024 · Updated Aug 2, 2024

NULL pointer dereference in Softing edgeConnector 3.60 and earlier allows remote attackers to crash its OPC UA server using an invalid client certificate. During session creation, the server dereferences a NULL pointer while processing the certificate rather than rejecting it. No authentication is required, and successful exploitation interrupts the service until it is restarted.

CVSS severity7.5
High
EPSS probability0.81%
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 Softing edgeConnector 3.60 and earlier allows remote attackers to crash its OPC UA server using an invalid client certificate. During session creation, the server dereferences a NULL pointer while processing the certificate rather than rejecting it. No authentication is required, and successful exploitation interrupts the service until it is restarted.

The record

CVE
CVE-2023-27336
Published
May 3, 2024
Updated
Aug 2, 2024
Vendor
Softing Industrial Automation GmbH
Product
edgeConnector
Classifications
CWE-476, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 3, 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=3.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Softing Industrial Automation GmbH · edgeConnectorversion=3.40
Softing Industrial Automation GmbH · edgeConnector Siemensversion=3.40

Published CVSS scores

7.5Softing Industrial Automation GmbHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5Zero Day InitiativeCVSS:3.0/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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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