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    CVE-2026-21926

    Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-25.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via TLS to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

    Published:Jan 20, 2026
    Last Modified:Apr 18, 2026
    EPS:Jan 20, 2026
    EPSS Score:0.00053
    CVSS Score:7.5

    Affected Products

    Vendor
    Oracle
    Product
    Siebel Crm Deployment
    Vendor
    Oracle
    Product
    Siebel Customer Relationship Management Deployment

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-70949 (CVSS 8.8) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). S…
    CVE-2026-70856 (CVSS 7.5) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Migration). Supported ver…
    CVE-2026-60798 (CVSS 8.5) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Migration). Supported ver…
    CVE-2026-60792 (CVSS 7.4) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). S…
    CVE-2026-60791 (CVSS 8.1) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Application Interface). S…
    CVE-2026-60753 (CVSS 7.8) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Installation). Supported …
    CVE-2026-47011 (CVSS 2.6) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Application Interface). S…
    CVE-2026-46888 (CVSS 7.8) — Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Database Upgrade). Suppor…

    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