EUVD-2026-53669
GHSA-9m32-jq6f-7wh4
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AC:H reflects that attacker must control or intercept the OPC UA server endpoint; all other network and impact metrics match the client-crash DoS.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service via the LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse and SOPC_StaMac_NewDeleteMonitoredItems in the client wrapper DeleteMonitoredItems path
AnalysisAI
Stack-based buffer overflow in Systerel S2OPC 1.7.3 enables remote denial of service against OPC UA client applications. A malicious or compromised OPC UA server can send a crafted DeleteMonitoredItemsResponse message that triggers an overflow in LockedStaMac_ProcessMsg_DeleteMonitoredItemsResponse and SOPC_StaMac_NewDeleteMonitoredItems within the client_wrapper state machine, crashing the client process. No public exploit or active exploitation has been identified at time of analysis, though source code references confirm the vulnerable code path exists in the published repository.
Technical ContextAI
S2OPC (Safe & Secure OPC) is an OPC UA (Open Platform Communications Unified Architecture) stack developed by Systerel, targeting industrial control system (ICS) and embedded safety-critical environments. OPC UA is a machine-to-machine communication protocol widely used in SCADA and industrial automation. The vulnerability resides in the client-side frontend wrapper at src/ClientServer/frontend/client_wrapper/internal/state_machine.c, specifically in the state machine function that processes DeleteMonitoredItemsResponse service messages returned by an OPC UA server. CWE-121 (Stack-based Buffer Overflow) identifies the root cause: insufficient bounds checking on data written to a stack-allocated buffer during response parsing, which can corrupt stack frames and cause process termination. The CPE provided (cpe:2.3:a:n/a:n/a) is non-informative and does not independently confirm affected version scope beyond what the CVE description states.
RemediationAI
No vendor-released patched version has been identified from the available data; the GitLab work item at https://gitlab.com/systerel/S2OPC/-/work_items/1780 should be monitored for patch release status. Until a patch is confirmed, operators should apply the following specific compensating controls: restrict OPC UA client connectivity to explicitly allowlisted, trusted server endpoints using firewall or application-level endpoint filtering to prevent clients from connecting to rogue or unknown servers; enforce mutual certificate authentication in OPC UA sessions so clients reject connections from servers presenting unrecognized certificates, raising the bar for server impersonation; deploy OPC UA traffic inspection at network boundaries to detect anomalous DeleteMonitoredItemsResponse message structures; and consider disabling or rate-limiting the DeleteMonitoredItems subscription workflow in deployments where monitored-item deletion is not operationally required. Disabling this feature may impact subscription management functionality. Organizations should consult Systerel directly via the vendor tracker and NVD advisory at https://nvd.nist.gov/vuln/detail/CVE-2026-67866.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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