Apache PLC4X 0.9.1 Discovery /apache/plc4x/plc4go redirect

Summaryinfo

A vulnerability has been found in Apache PLC4X and classified as problematic. Affected by this vulnerability is an unknown functionality of the file /apache/plc4x/plc4go of the component Discovery. Performing a manipulation results in redirect. This vulnerability is cataloged as CVE-2026-102511. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Apache PLC4X. This affects an unknown part of the file /apache/plc4x/plc4go of the component Discovery. The manipulation with an unknown input leads to a redirect vulnerability. CWE is classifying the issue as CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. This is going to have an impact on integrity. The summary by CVE is:

Improper Verification of Source of a Communication Channel in the ADS discovery of the Go implementation of Apache PLC4X (PLC4Go) allows an attacker able to send UDP datagrams to the discovering host to redirect subsequent connections to an arbitrary, attacker-chosen address. The discovery result's connection address was derived from the AmsNetId claimed in the response body rather than from the datagram's actual source address. One spoofed discovery response can therefore insert an inventory entry pointing at any host, including hosts outside the local network, and an application that connects to discovered devices will open its ADS session, including any configured route credentials, to that host. Additionally, discovery listeners in both implementations can be disabled by a single malformed datagram: - In PLC4Go ADS discovery, a short version block causes a panic that ends the listener for the rest of the discovery call, so legitimate devices answering afterwards are not reported. - In PLC4J, the ADS and EtherNet/IP discoverers stop on an unhandled exception from a malformed response. - The PLC4J Modbus discoverer can be made to spin indefinitely, consuming a CPU core, by a scanned host that sends a partial response. Exploitation requires the application to invoke the discovery API, which is opt-in, and for the connection redirect, to act on the discovered items. This issue affects Apache PLC4X: PLC4Go from 0.11.0 before 1.0.0; PLC4J ADS and Modbus drivers from 0.10.0 before 1.0.0; PLC4J EtherNet/IP driver from 0.11.0 before 1.0.0. PLC4Go is consumed as the Go module github.com/apache/plc4x/plc4go; versions refer to the corresponding Apache PLC4X releases. Users are recommended to upgrade to version 1.0.0, which fixes the issue. Version 1.0.0 derives the connection address from the datagram's source address and logs a warning when the claimed AmsNetId disagrees with it.

It is possible to read the advisory at lists.apache.org. This vulnerability is uniquely identified as CVE-2026-102511 since 09/29/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/30/2026). The attack technique deployed by this issue is T1204.001 according to MITRE ATT&CK.

Upgrading to version 1.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• Apache

Name

• PLC4X

Version

• 0.9.1

License

• open-source

Website

• Vendor: https://www.apache.org/

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