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    CVE-2026-18257

    Improper validity period check for root issuer certificate in CycloneCrypto cryptographic wrapper of S2OPC allows a certificate issued by this root issuer to be considered trusted

    Published:Jul 29, 2026
    Last Modified:Jul 29, 2026
    EPS:Jul 29, 2026
    EPSS Score:
    CVSS Score:5.6

    Affected Products

    Vendor
    Systerel
    Product
    S2opc

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-295 Improper Certificate Validation

    Related CVEs

    CVE-2026-82619 (CVSS 2.1) — A vulnerability was identified in Systerel S2OPC up to 1.7.3. The impacted element is the function monitored_i…
    CVE-2026-82618 (CVSS 5.3) — A vulnerability was determined in Systerel S2OPC up to 1.7.3. The affected element is the function set_range_m…
    CVE-2026-78049 (CVSS 2.9) — A vulnerability has been found in Systerel S2OPC up to 1.7.3. Impacted is the function SOPC_NodeMgtHelperInter…
    CVE-2026-67868 (CVSS 9.8) — A heap-based out-of-bounds write vulnerability exists in S2OPC 1.7.3 in server-side EventFilter handling durin…
    CVE-2026-67866 (CVSS 7.5) — Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service vi…
    CVE-2026-67872 (CVSS 7.5) — An issue in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service via the event monitored…
    CVE-2026-67865 (CVSS 7.5) — S2OPC 1.7.3 contains an out-of-bounds read in RepublishResponse handling. This allows a remote attacker to cau…
    CVE-2026-67871 (CVSS 7.5) — Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service vi…
    CVE-2026-67867 (CVSS 7.5) — Buffer Overflow vulnerability in Systerel S2OPC 1.7.3 allows a remote attacker to cause a denial of service vi…
    CVE-2026-18790 (CVSS 1.9) — A weakness has been identified in Systerel S2OPC up to 1.7.3. This affects the function LockedStaMac_ProcessMs…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High