How severe is CVE-2023-27336?

CVE-2023-27336 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-27336 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-27336?

CVE-2023-27336 primarily affects Softing Edgeaggregator. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-27336?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2023-27336 have an EU (EUVD) identifier?

Yes. CVE-2023-27336 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-31112.

When was CVE-2023-27336 published?

CVE-2023-27336 was published on 2024-05-03 and last updated on 2026-06-17.

CVE-2023-27336

CVE-2023-27336 is a high-severity vulnerability in Softing Edgeaggregator with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-31112
Weakness: CWE-476
Affected product: Softing Edgeaggregator
Published: 2024-05-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-27336?: 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.
How severe is CVE-2023-27336?: CVE-2023-27336 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-27336 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-27336?: CVE-2023-27336 primarily affects Softing Edgeaggregator. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-27336?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2023-27336 have an EU (EUVD) identifier?: Yes. CVE-2023-27336 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-31112.
When was CVE-2023-27336 published?: CVE-2023-27336 was published on 2024-05-03 and last updated on 2026-06-17.

References

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

Affected products (3)

cpe:2.3:a:softing:edgeaggregator:*:*:*:*:*:*:*:*
cpe:2.3:a:softing:edgeconnector:*:*:*:*:*:*:*:*
cpe:2.3:a:softing:secure_integration_server:*:*:*:*:*:*:*:*

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