CVE-2026-21926 Denial of service in Siebel CRM Deployment
Unauthenticated attackers can cause a complete denial of service in Oracle Siebel CRM Deployment via network access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-21926?
CVE-2026-21926 is a high-severity denial of service vulnerability in Oracle Corporation Siebel CRM Deployment, published on 20 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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).
Which versions are affected by CVE-2026-21926?
It affects 1 product.
Products include Oracle Siebel Customer Relationship Management Deployment.
How do I fix CVE-2026-21926?
No fix has been published for CVE-2026-21926 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-21926 being exploited?
There is no known exploitation of CVE-2026-21926 in the wild and no public exploit code.
Sources
Also known as GHSA-wmrv-g7fp-h432.