How severe is CVE-2026-21926?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Oracle Siebel Customer Relationship Management Deployment

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).

EPSS: 0.004 (28.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Oracle Siebel_customer_relationship_management_deployment
Oracle Corporation Siebel Crm Deployment — versions 17.0

References

secalert_us@oracle.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21926?: CVE-2026-21926 is a high-severity vulnerability in Oracle Siebel Customer Relationship Management Deployment. CVSS score: 7.5/10. Published 2026-01-20.
How severe is CVE-2026-21926?: High severity. CVSS v3 base score is 7.5 out of 10.