Is CVE-2023-27336 in the CISA KEV catalog?

No. CVE-2023-27336 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-27336?

CVE-2023-27336 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2023-27336?

CVE-2023-27336 has an EPSS score of 0.75% (51th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-27336?

Upgrade edgeaggregator to 3.70 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-27336

HIGH

7.5

CVSS v3

NVD

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

edgeaggregatorNVD

Affected:< 3.70Fixed in:3.70CVE-2023-27336derived from NVD

edgeconnectorNVD

Affected:< 3.70Fixed in:3.70CVE-2023-27336derived from NVD

secure integration serverNVD

Affected:< 1.30Fixed in:1.30CVE-2023-27336derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.75%probability of exploitation in 30 days

51stpercentile

Moderate risk: more likely to be exploited than 51% of all known CVEs.

References

Third-Party Advisory1

zerodayinitiative.com

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-13.