CVE-2025-21547 Denial of service in Oracle Hospitality OPERA 5

Critical 9.1 Published 21 Jan 2025 Updated 18 Mar 2025

Unauthenticated attackers can cause denial of service and access critical data in Oracle Hospitality OPERA 5 via HTTP.

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-2025-21547?

CVE-2025-21547 is a critical denial of service vulnerability in Oracle Hospitality OPERA 5, 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 Hospitality OPERA 5 product of Oracle Hospitality Applications (component: Opera Servlet). Supported versions that are affected are 5.6.19.20, 5.6.25.8, 5.6.26.6 and 5.6.27.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Hospitality OPERA 5. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Hospitality OPERA 5 accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Hospitality OPERA 5. CVSS 3.1 Base Score 9.1 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

Weakness: CWE-400

Which versions are affected by CVE-2025-21547?

It affects 1 product.

Products include Oracle Hospitality Opera 5.

How do I fix CVE-2025-21547?

No fix has been published for CVE-2025-21547 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-2025-21547 being exploited?

There is no known exploitation of CVE-2025-21547 in the wild and no public exploit code.

Sources

Also known as GHSA-wcg3-v8j6-c8gg.