RT-Labs AB C-Open CANopen contains a write protection bypass in the SDO (Service Data Object) server implementation 'src/co_sdo_server.c' that fails to properly validate write permissions when processing download-segment frames. An unauthenticated attacker on the CAN bus can initiate an SDO upload for a read-only Object Dictionary (OD) entry, which sets a data pointer to the read-only object, then send download-segment frames to write to that memory location. The download-segment handler does not verify that a download session is active, allowing any CANopen node to overwrite read-only OD entries using two SDO frames. Note that CANopen protocol operates over CAN bus and does not provide built-in authentication mechanisms. Fixed in 1.1.1.
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Affected Vendors & Products
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History
Thu, 08 Oct 2026 07:30:00 +0000
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ssvc
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Fri, 02 Oct 2026 15:15:00 +0000
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Rt-labs Ab
Rt-labs Ab c-open |
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Rt-labs Ab c-open |
Thu, 01 Oct 2026 20:00:00 +0000
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| Description | RT-Labs AB C-Open CANopen contains a write protection bypass in the SDO (Service Data Object) server implementation 'src/co_sdo_server.c' that fails to properly validate write permissions when processing download-segment frames. An unauthenticated attacker on the CAN bus can initiate an SDO upload for a read-only Object Dictionary (OD) entry, which sets a data pointer to the read-only object, then send download-segment frames to write to that memory location. The download-segment handler does not verify that a download session is active, allowing any CANopen node to overwrite read-only OD entries using two SDO frames. Note that CANopen protocol operates over CAN bus and does not provide built-in authentication mechanisms. Fixed in 1.1.1. | |
| Title | RT-Labs AB C-Open CANopen SDO Server Write Protection Bypass | |
| Weaknesses | CWE-863 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: cisa-cg
Published: 2026-10-01T19:42:16.559Z
Updated: 2026-10-07T15:52:15.539Z
Reserved: 2026-08-28T18:10:39.170Z
Link: CVE-2026-82358
Updated: 2026-10-07T15:51:51.428Z
Status : Deferred
Published: 2026-10-01T20:17:32.540
Modified: 2026-10-07T16:19:07.003
Link: CVE-2026-82358
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