Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-13T00:00:00 OpENer: OpENer: Out-of-bounds read via malformed ForwardOpen requests 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CWE-125

EIPStackGroup OpENer 2.3.0 (commit 76b95cf) has an out-of-bounds read issue in Connection Manager handling of ForwardOpen requests when processing short malformed packets. An attacker can send a valid ENIP outer frame carrying a malformed CIP ForwardOpen/LargeForwardOpen request, causing the parser to continue reading fields even when request data is insufficient. This issue is remotely triggerable via network traffic and does not require authentication.

A flaw was found in OpENer. An out-of-bounds read vulnerability exists in the Connection Manager when processing malformed ForwardOpen requests. A remote attacker can send a specially crafted Ethernet/IP (ENIP) frame with an insufficient Common Industrial Protocol (CIP) ForwardOpen/LargeForwardOpen request. This can cause the parser to read beyond the intended buffer, potentially leading to a denial of service or information disclosure.

Red Hat Hardened Images Affected python3.14 Red Hat Hardened Images Affected rust https://www.cve.org/CVERecord?id=CVE-2026-51537 https://nvd.nist.gov/vuln/detail/CVE-2026-51537 https://gist.github.com/MrAlaskan/a5fb0fb7765c9df80d28220ed558f04e https://github.com/EIPStackGroup/OpENer/issues/564