Oracle Net Services: missing authentication
Critical9.1CVE-2026-47040 · Published Jul 21, 2026 · updated Aug 6, 2026
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Net Services accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. 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).
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Oracle Net Services Product | >= 19.3, <= 19.31 | No fix yet |
| >= 21.3, <= 21.22 | No fix yet | |
| >= 23.4.0, <= 23.26.2 | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-306
More Oracle advisories
All Oracle| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 21 | Oracle HRMS (US): takeover via Internal Operations | High7.8 | No fix yet |
| Jul 21 | Oracle HRMS (US): data exposure via Internal Operations | Medium6.5 | No fix yet |
| Jul 21 | Oracle Work in Process: data tampering via Internal Operations | Medium5.4 | No fix yet |
| Jul 21 | Oracle HRMS (US): data tampering via US Payroll Year End | High7.1 | No fix yet |
| Jul 21 | Oracle HRMS (UK): data exposure via UK Payroll | High7.7 | No fix yet |
| Jul 21 | Oracle Java SE: takeover via Install | High7.8 | No fix yet |