VDB-327401 · CVE-2025-53476 · TALOS-2025-2223

OpenPLC v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58 TCP Connection missing release of file descriptor or handle after effective lifetime

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.
5.2	$0-$5k	0.71

Summaryinfo

A vulnerability marked as problematic has been reported in OpenPLC v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. This affects an unknown function of the component TCP Connection Handler. The manipulation leads to missing release of file descriptor or handle after effective lifetime. This vulnerability is documented as CVE-2025-53476. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in OpenPLC v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. It has been rated as problematic. This issue affects an unknown code of the component TCP Connection Handler. The manipulation with an unknown input leads to a missing release of file descriptor or handle after effective lifetime vulnerability. Using CWE to declare the problem leads to CWE-775. The product does not release a file descriptor or handle after its effective lifetime has ended, i.e., after the file descriptor/handle is no longer needed. Impacted is availability. The summary by CVE is:

A denial of service vulnerability exists in the ModbusTCP server functionality of OpenPLC _v3 a931181e8b81e36fadf7b74d5cba99b73c3f6d58. A specially crafted series of network connections can lead to the server not processing subsequent Modbus requests. An attacker can open a series of TCP connections to trigger this vulnerability.

The advisory is shared at talosintelligence.com. The identification of this vulnerability is CVE-2025-53476 since 07/11/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-32061). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

OpenPLC v3

Version

a931181e8b81e36fadf7b74d5cba99b73c3f6d58

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (talos): 🔒

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing release of file descriptor or handle after effective lifetime
CWE: CWE-775 / CWE-400 / CWE-404
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

07/11/2025 CVE reserved
10/07/2025 +88 days Advisory disclosed
10/07/2025 +0 days VulDB entry created
11/03/2025 +27 days VulDB entry last update

Sourcesinfo

Advisory: TALOS-2025-2223
Status: Not defined

CVE: CVE-2025-53476 (🔒)
GCVE (CVE): GCVE-0-2025-53476
GCVE (VulDB): GCVE-100-327401
EUVD: 🔒

Entryinfo

Created: 10/07/2025 16:58
Updated: 11/03/2025 21:04
Changes: 10/07/2025 16:58 (61), 11/03/2025 21:04 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.