CVE-2025-49176 – This vulnerability in the Big Requests extensio... (How to Fix)

Q: What is the severity of CVE-2025-49176?

CVE-2025-49176 has a CVSS score of 7.3 (HIGH). This vulnerability in the Big Requests extension allows attackers to bypass size limit checks through an integer overflow when request length is multiplied by 4 before validation. This could enable buffer overflow attacks or memory corruption. Systems using the affected Big Requests extension are vulnerable.

📋 TL;DR

This vulnerability in the Big Requests extension allows attackers to bypass size limit checks through an integer overflow when request length is multiplied by 4 before validation. This could enable buffer overflow attacks or memory corruption. Systems using the affected Big Requests extension are vulnerable.

💻 Affected Systems

Products:

Big Requests extension

Versions: Versions prior to patched releases referenced in Red Hat advisories

Operating Systems: Linux distributions with affected packages

Default Config Vulnerable: ⚠️ Yes

Notes: Systems using the Big Requests extension with default configurations are vulnerable. Specific affected packages vary by Red Hat distribution.

⚠️ Manual Verification Required

This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.

Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).

🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.

Recommended Actions:

Review the CVE details at NVD
Check vendor security advisories for your specific version
Test if the vulnerability is exploitable in your environment
Consider updating to the latest version as a precaution

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or service disruption.

🟠

Likely Case

Denial of service through memory corruption or application crashes.

🟢

If Mitigated

Limited impact with proper input validation and memory protection mechanisms in place.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting specific requests to trigger the integer overflow. No public exploit code is currently known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Refer to specific Red Hat advisories for version numbers

Vendor Advisory: https://access.redhat.com/errata/RHSA-2025:10258

Restart Required: Yes

Instructions:

1. Identify affected packages using 'rpm -qa | grep [package-name]'
2. Apply updates via 'yum update' or 'dnf update'
3. Restart affected services or reboot system

🔧 Temporary Workarounds

Disable Big Requests Extension

linux

Temporarily disable the vulnerable extension if not required

# Check if extension is loaded
# Disable via configuration file or module unloading

🧯 If You Can't Patch

Implement network segmentation to isolate vulnerable systems
Deploy web application firewall with input validation rules

🔍 How to Verify

Check if Vulnerable:

Check installed package versions against Red Hat advisories: 'rpm -qa | grep [affected-package]'

Check Version:

rpm -q [package-name] --queryformat '%{VERSION}-%{RELEASE}\n'

Verify Fix Applied:

Verify updated package version and check for successful installation: 'rpm -q [package-name]'

📡 Detection & Monitoring

Log Indicators:

Unusually large request sizes
Memory allocation failures
Application crashes related to request processing

Network Indicators:

Abnormally sized network packets to affected services
Repeated connection attempts with varying request sizes

SIEM Query:

source="application_logs" AND ("memory error" OR "overflow" OR "request size")

📊 Metadata

CVE ID: CVE-2025-49176

CVSS v3 Score: 7.3 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H

CWE: CWE-190

EPSS Score: 0.05% exploit probability (14.4th percentile)

Published: June 17, 2025

Last Updated: December 11, 2025

🔗 References

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