November 15, 2026

CVE Watchtower

CVE-2025-21547Oracle Hospitality Opera Uncontrolled Resource Consumption

NVDCVSS scored by secalert_us@oracle.com

Vulnerability Summary

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).
Severity Level
CRITICAL(9.1)
Published Date
Jan 21, 2025
Last Modified
Jun 23, 2025
Exploitation Status
No confirmed exploitation yet
Root Weakness (CWE)
CWE-400: Uncontrolled Resource Consumption β†—
The product does not properly control the allocation and maintenance of a limited resource, enabling denial-of-service conditions.
CVSS v3.1 Base Metrics — Score 9.1 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Oracle Hospitality Opera 5
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run Oracle Hospitality Opera and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.

Timeline

  • Jan 21, 2025Published
  • Jun 23, 2025Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 15, 2026 06:15 UTC