VDB-236749 · CVE-2023-39479 · ZDI-23-1061

Softing Secure Integration Server OPC UA Gateway file access

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Softing Secure Integration Server. The impacted element is an unknown function of the component OPC UA Gateway. This manipulation causes an unknown weakness. The identification of this vulnerability is CVE-2023-39479. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in Softing Secure Integration Server (affected version not known) and classified as critical. Affected by this vulnerability is some unknown functionality of the component OPC UA Gateway. The CWE definition for the vulnerability is CWE-552. The product makes files or directories accessible to unauthorized actors, even though they should not be. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Softing Secure Integration Server OPC UA Gateway Directory Creation Vulnerability. This vulnerability allows remote attackers to create directories on affected installations of Softing Secure Integration Server. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of FileDirectory OPC UA Objects. The issue results from allowing unauthorized access to the filesystem. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-20548.

The weakness was shared 08/10/2023 as ZDI-23-1061. The advisory is shared at zerodayinitiative.com. This vulnerability is known as CVE-2023-39479 since 08/02/2023. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/12/2025). MITRE ATT&CK project uses the attack technique T1083 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

Softing

Name

Secure Integration Server

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 6.6
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔍

CNA Base Score: 6.6
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: File access
CWE: CWE-552 / CWE-425
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/02/2023 🔍
08/10/2023 +8 days 🔍
08/10/2023 +0 days 🔍
08/12/2025 +733 days 🔍

Sourcesinfo

Advisory: ZDI-23-1061
Status: Not defined

CVE: CVE-2023-39479 (🔍)
GCVE (CVE): GCVE-0-2023-39479
GCVE (VulDB): GCVE-100-236749

Entryinfo

Created: 08/10/2023 09:11
Updated: 08/12/2025 17:15
Changes: 08/10/2023 09:11 (35), 08/12/2025 17:15 (38)
Complete: 🔍
Cache ID: 216::103