CVE-2021-40031 – This CVE describes a null pointer dereference v... (How to Fix)

Q: What is the severity of CVE-2021-40031?

CVE-2021-40031 has a CVSS score of 7.5 (HIGH). This CVE describes a null pointer dereference vulnerability in the camera module of certain Huawei smartphones. Exploitation could allow attackers to crash the camera service or potentially execute arbitrary code, affecting device availability and integrity. Only specific Huawei smartphone models running vulnerable software versions are affected.

📋 TL;DR

This CVE describes a null pointer dereference vulnerability in the camera module of certain Huawei smartphones. Exploitation could allow attackers to crash the camera service or potentially execute arbitrary code, affecting device availability and integrity. Only specific Huawei smartphone models running vulnerable software versions are affected.

💻 Affected Systems

Products:

Huawei smartphones with specific camera modules

Versions: Specific EMUI versions prior to January 2022 security patches

Operating Systems: Android with Huawei EMUI

Default Config Vulnerable: ⚠️ Yes

Notes: Exact models not specified in public advisory; requires checking Huawei security bulletins for specific affected devices.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete device compromise, data theft, or persistent backdoor installation.

🟠

Likely Case

Camera service crash causing temporary loss of camera functionality until device restart.

🟢

If Mitigated

Minimal impact with proper patching and security controls in place.

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: LOW

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: HIGH

Null pointer dereference vulnerabilities typically require specific conditions to trigger and may be difficult to exploit reliably for code execution.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: January 2022 security patch or later

Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2022/1/

Restart Required: Yes

Instructions:

1. Check for system updates in Settings > System & updates > Software update. 2. Install January 2022 or later security patch. 3. Restart device after update completes.

🔧 Temporary Workarounds

Disable camera permissions

all

Temporarily disable camera access for all apps to reduce attack surface

Restrict camera usage

all

Avoid using camera functionality until patched

🧯 If You Can't Patch

Isolate affected devices from untrusted networks
Implement strict app installation policies to prevent malicious apps

🔍 How to Verify

Check if Vulnerable:

Check Settings > About phone > Build number for EMUI version and security patch date. If before January 2022, device may be vulnerable.

Check Version:

Not applicable for mobile devices; use Settings menu as described.

Verify Fix Applied:

Verify security patch level shows January 2022 or later in Settings > About phone.

📡 Detection & Monitoring

Log Indicators:

Camera service crashes
Null pointer exception logs in system logs

Network Indicators:

Unusual camera-related network activity from mobile devices

SIEM Query:

Not typically applicable for mobile device vulnerabilities

📊 Metadata

CVE ID: CVE-2021-40031

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-476

Published: January 10, 2022

Last Updated: November 21, 2024

🔗 References

https://consumer.huawei.com/en/support/bulletin/2022/1/ Vendor Advisory
https://consumer.huawei.com/en/support/bulletin/2022/1/ Vendor Advisory

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🔗 Related Vulnerabilities

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