# Multiple remote code execution flaws in Oracle Database Server

Published: 2026-09-16 · Severity: routine
Canonical: https://vorant.io/reports/62de5d57-7fc4-58c3-a13d-59f5dc1be7ba/multiple-remote-code-execution-flaws-in-oracle-database-server

> Multiple vulnerabilities in Oracle Database Server enable remote code execution and denial of service across versions 19–23.

CERT-FR has released an advisory documenting multiple vulnerabilities affecting Oracle Database Server. The affected versions span three major release lines: versions 19.3 through 19.32, versions 21.3 through 21.23, and versions 23.4.0 through 23.26.3. These vulnerabilities permit remote attackers to achieve arbitrary code execution and denial of service conditions. The advisory references eleven distinct CVE identifiers, indicating a substantial set of flaws addressed in a single patch cycle. Defenders operating Oracle Database Server installations should prioritize patching to mitigate both the remote code execution and denial of service risks. The vendor's security bulletin (cspusep2026 from 15 September 2026) contains the specific patch versions and remediation guidance. Given the breadth of affected versions and the severity of the impacts—particularly arbitrary code execution—this advisory should be treated as high priority for any environment running the named versions.

## Mentioned in this report

- Vulnerabilities: CVE-2026-83088, CVE-2026-83156, CVE-2026-83160, CVE-2026-83271, CVE-2026-83272, CVE-2026-83333, CVE-2026-83347, CVE-2026-83348, CVE-2026-83349, CVE-2026-83350, CVE-2026-83351

## Detection guidance (public sample)

### Oracle Database Server Process Spawning Shell or Download Utility

ATT&CK: T1190

Oracle database server or listener process spawning a command shell or common download/recon utility, a post-exploitation pattern after remote code execution in the database service. Auto-generated starting point — validate and tune in your environment before deploying. IOC matches can false-positive on shared infrastructure and decay as adversary infrastructure rotates.

```yaml
title: Oracle Database Server Process Spawning Shell or Download Utility
id: 82777c9b-493b-507c-b178-1688f41b306c
status: experimental
description: Detects oracle.exe or tnslsnr.exe spawning a command interpreter or common
  LOLBin. The CERT-FR advisory describes remote code execution flaws in Oracle Database
  Server but gives no exploit details, so this rule covers the generic post-exploitation
  consequence rather than any specific CVE.
tags:
- attack.initial-access
- attack.t1190
- attack.execution
- attack.t1059
logsource:
  category: process_creation
  product: windows
detection:
  selection_parent:
    ParentImage|endswith:
    - \oracle.exe
    - \tnslsnr.exe
  selection_child:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \pwsh.exe
    - \wscript.exe
    - \cscript.exe
    - \mshta.exe
    - \certutil.exe
    - \bitsadmin.exe
    - \curl.exe
    - \whoami.exe
    - \net.exe
    - \net1.exe
  filter_known_jobs:
    CommandLine|contains:
    - \admin\
    - \rdbms\
  condition: selection_parent and selection_child and not filter_known_jobs
falsepositives:
- DBA-configured DBMS_SCHEDULER external jobs or external procedures that intentionally
  invoke cmd.exe batch scripts
- Oracle backup or RMAN wrapper scripts launched from the database service account
level: medium
author: Vorant
references:
- https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1184
```

Behavioural rules are generated from public reporting — validate in your environment before deploying.

Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1184

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