CVE-2025-21549 Denial of service in Oracle WebLogic Server

What is CVE-2025-21549?

CVE-2025-21549 is a high-severity denial of service vulnerability in Oracle Weblogic Server, published on 21 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). The supported version that is affected is 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle WebLogic Server. 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).

Weakness: CWE-400

Which versions are affected by CVE-2025-21549?

It affects 1 product.

Products include Oracle Weblogic Server.

How do I fix CVE-2025-21549?

Apply the vendor's patch.

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-2025-21549 being exploited?

There is no known exploitation of CVE-2025-21549 in the wild and no public exploit code.

Other vulnerabilities in Oracle Weblogic Server

• CVE-2020-14750 Oracle WebLogic Server Remote Code Execution Exploited Critical 9.8
• CVE-2020-14882 Oracle WebLogic Server Remote Code Execution Exploited Critical 9.8
• CVE-2020-14644 Oracle WebLogic Server Remote Code Execution Exploited Critical 9.8
• CVE-2020-2883 Oracle WebLogic Server Unspecified Exploited Critical 9.8
• CVE-2020-2551 Oracle Fusion Middleware Unspecified Exploited Critical 9.8

All Oracle Weblogic Server vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-JM01549, GHSA-748w-f5ch-qpr7.