CVE-2025-41739
CODESYS Control - Linux/QNX SysSocket flaw
Description
An unauthenticated remote attacker, who beats a race condition, can exploit a flaw in the communication servers of the CODESYS Control runtime system on Linux and QNX to trigger an out-of-bounds read via crafted socket communication, potentially causing a denial of service.
INFO
Published Date :
Dec. 1, 2025, 10:16 a.m.
Last Modified :
June 17, 2026, 9:23 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-41739
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 270ccfa6-a436-4e77-922e-914ec3a9685c | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update CODESYS Control runtime system to the latest version.
- Install available security patches from the vendor.
- Verify communication server security configurations.
- Monitor network traffic for suspicious patterns.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-41739.
| URL | Resource |
|---|---|
| https://certvde.com/de/advisories/VDE-2025-099 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-41739 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-41739
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-41739 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-41739 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'CODESYS', 'product': 'CODESYS PLCHandler', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.21.40', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Remote Target Visu', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.21.40', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Runtime Toolkit', 'versions': [{'status': 'affected', 'version': '3.5.21.0', 'lessThan': '3.5.21.40', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for BeagleBone SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for emPC-A/iMX6 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for IOT2000 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Linux ARM SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Linux SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PFC100 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PFC200 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for PLCnext SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for Raspberry Pi SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Control for WAGO Touch Panels 600 SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Edge Gateway for Linux', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS TargetVisu for Linux SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}, {'vendor': 'CODESYS', 'product': 'CODESYS Virtual Control SL', 'versions': [{'status': 'affected', 'version': '4.15.0.0', 'lessThan': '4.19.0.0', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-41739', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2025-12-01T14:03:10.321003Z'} -
New CVE Received by [email protected]
Dec. 01, 2025
Action Type Old Value New Value Added Description An unauthenticated remote attacker, who beats a race condition, can exploit a flaw in the communication servers of the CODESYS Control runtime system on Linux and QNX to trigger an out-of-bounds read via crafted socket communication, potentially causing a denial of service. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-125 Added Reference https://certvde.com/de/advisories/VDE-2025-099