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CVE-2021-2451

7.5 HIGH
Denial of Service

📋 TL;DR

This vulnerability in Oracle Outside In Technology allows unauthenticated attackers to cause denial of service by crashing or hanging the software. It affects Oracle Fusion Middleware using Outside In Filters version 8.5.5. Organizations using Oracle products that incorporate this SDK are vulnerable if they process untrusted data.

💻 Affected Systems

Products:
  • Oracle Fusion Middleware with Outside In Filters component
Versions: 8.5.5
Operating Systems: All platforms supported by Oracle Outside In Technology
Default Config Vulnerable: ⚠️ Yes
Notes: This is an SDK vulnerability, so actual impact depends on how applications implement Oracle Outside In Technology. Any application that passes untrusted data to the SDK is vulnerable.

📦 What is this software?

Outside In Technology by Oracle

View all CVEs affecting Outside In Technology →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete denial of service for any application using Oracle Outside In Technology, potentially affecting multiple business systems that rely on document processing capabilities.

🟠

Likely Case

Targeted attacks causing service disruption to specific applications using Outside In Technology for document processing, particularly in internet-facing systems.

🟢

If Mitigated

Limited impact if proper network segmentation and input validation are implemented, restricting exposure to trusted sources only.

🌐 Internet-Facing: HIGH
🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No
Weaponized: UNKNOWN
Unauthenticated Exploit: ⚠️ Yes
Complexity: LOW

Oracle describes this as 'easily exploitable' via HTTP. The vulnerability requires network access but no authentication.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Later versions of Oracle Outside In Technology (check Oracle Critical Patch Update)

Vendor Advisory: https://www.oracle.com/security-alerts/cpujul2021.html

Restart Required: Yes

Instructions:

1. Apply the July 2021 Critical Patch Update from Oracle. 2. Update Oracle Outside In Technology to a patched version. 3. Restart affected services. 4. Verify applications using the SDK are updated.

🔧 Temporary Workarounds

Network Segmentation

all

Restrict network access to systems using Oracle Outside In Technology to trusted sources only

Input Validation

all

Implement strict input validation before passing data to Outside In Technology components

🧯 If You Can't Patch

  • Implement network controls to restrict access to affected systems from untrusted networks
  • Monitor for abnormal process crashes or hangs in applications using Oracle Outside In Technology

🔍 How to Verify

Check if Vulnerable:

Check Oracle Outside In Technology version - if version 8.5.5 is installed, the system is vulnerable

Check Version:

Check Oracle documentation for specific version checking commands based on implementation

Verify Fix Applied:

Verify Oracle Outside In Technology version has been updated beyond 8.5.5 and July 2021 CPU is applied

📡 Detection & Monitoring

Log Indicators:

  • Unexpected process crashes or hangs in applications using Oracle Outside In Technology
  • Multiple failed document processing attempts from single sources

Network Indicators:

  • HTTP requests to document processing endpoints followed by service disruption
  • Abnormal traffic patterns to systems known to use Oracle Outside In Technology

SIEM Query:

Search for: 'process crash' AND 'Oracle Outside In' OR 'document processing failure' AND source_ip

📊 Metadata

CVE ID: CVE-2021-2451
CVSS v3 Score: 7.5 (HIGH)
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: July 21, 2021
Last Updated: November 21, 2024

🔗 References

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