Improper Certificate Validation in S2OPC
Priority LOW 37CWE-295Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-295.
Summary
Improper comparison with the certificates trusted list in S2OPC allows an attacker well-formed untrusted certificate to be considered trusted
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00119 1st percentileScored 2026-11-07
Fix Fixed S2OPC (Systerel): 1.7.3
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA S2OPC (Systerel) Fixed in 1.7.3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9758
- 2026-10-03 Alias added: GHSA-q89f-427x-5p67
References
More Systerel vulnerabilities
- TI-2026-54290 Systerel S2OPC AddNodes Service sopc_node_mgt_helper_internal.c out-of-bounds CVSS 4.0MEDIUM 6.3
- TI-2026-61689 S2OPC through 1.7.3 NULL Pointer Dereference in alloc_notification_message_items() CVSS 4.0MEDIUM 6.0
- TI-2026-56960 Systerel S2OPC subscription_mgr.c use after free CVSS 4.0MEDIUM 5.3
- TI-2026-56959 Systerel S2OPC String Array Range Writing sopc_builtintypes.c set_range_matrix_on_string_array out-of-bounds CVSS 4.0MEDIUM 5.3
- TI-2026-15394 Systerel S2OPC DeleteMonitoredItemsRequest state_machine.c out-of-bounds CVSS 4.0MEDIUM 4.8
- TI-2026-15010 Improper Certificate Validation in S2OPC CVSS 3.1MEDIUM 5.6
Sources
- CVE-2026-9758 · CVE Program
- CVE-2026-9758 · NVD
- FIRST EPSS
- GHSA-q89f-427x-5p67 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences