CVE-2023-27336: Softing edgeConnector Siemens OPC UA Server Null Pointer Dereference Denial-of-Service Vulnerability

Q: How do I fix CVE-2023-27336?

edgeaggregator: upgrade to 3.70; edgeconnector: upgrade to 3.70; secure integration server: upgrade to 1.30. Exact commands for each OS are on this page.

Q: Is CVE-2023-27336 being exploited?

CVE-2023-27336 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-27336 affect?

CVE-2023-27336 affects edgeaggregator, edgeconnector, secure integration server. Severity is high (CVSS 7.5). 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 Siem

Q: How urgent is CVE-2023-27336?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADEUPGRADE

CVE-2023-27336 is a high-severity flaw (CVSS 7.5) affecting edgeaggregator, edgeconnector, secure integration server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.8% (top 43%)
CISA exploited list	No
Weakness	CWE-476
Published	2024-05-03
Last modified	2026-06-17

Publisher (CNA): Zero Day Initiative · Vendor: softing

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-05-03 02:15 UTCPublished CVE record published
2026-06-17 05:44 UTCUpdated Record last modified

softing edgeaggregator UPGRADE

Affected: < 3.70

Fixed in: 3.70

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy edgeaggregator || rpm -q edgeaggregator || edgeaggregator --version

2. UPGRADE to 3.70 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade edgeaggregator

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade edgeaggregator

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

softing edgeconnector UPGRADE

Affected: < 3.70

Fixed in: 3.70

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy edgeconnector || rpm -q edgeconnector || edgeconnector --version

2. UPGRADE to 3.70 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade edgeconnector

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade edgeconnector

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

softing secure integration server UPGRADE

Affected: < 1.30

Fixed in: 1.30

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy secure-integration-server || rpm -q secure-integration-server || secure-integration-server --version

2. UPGRADE to 1.30 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade secure-integration-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade secure-integration-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-27336?

edgeaggregator: upgrade to 3.70; edgeconnector: upgrade to 3.70; secure integration server: upgrade to 1.30. Exact commands for each OS are on this page.

Is CVE-2023-27336 being exploited?

CVE-2023-27336 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-27336 affect?

CVE-2023-27336 affects edgeaggregator, edgeconnector, secure integration server. Severity is high (CVSS 7.5). 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 Siem

How urgent is CVE-2023-27336?

Priority 45/100. High severity; Remotely exploitable, no login, no user action

Software pages

Siemens vulnerabilities

Related CVEs

CVE-2024-0860 HIGH 8.0 DOWNGRADE DOWNGRADE The affected product is vulnerable to a cleartext transmission of sensitive information vulnerability, which
CVE-2023-39482 MEDIUM 6.5 UPGRADE UPGRADE Softing Secure Integration Server Hardcoded Cryptographic Key Information Disclosure Vulnerability
CVE-2023-38126 HIGH 7.2 DOWNGRADE Softing edgeAggregator Restore Configuration Directory Traversal Remote Code Execution Vulnerability
CVE-2023-38125 HIGH 8.8 UPGRADE UPGRADE Softing edgeAggregator Permissive Cross-domain Policy with Untrusted Domains Remote Code Execution Vulnerabili
CVE-2023-27335 CRITICAL 9.6 UPGRADE UPGRADE Softing edgeAggregator Client Cross-Site Scripting Remote Code Execution Vulnerability

References

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