CVE-2021-22353 – This CVE describes a memory buffer operation li... (How to Fix)

Q: What is the severity of CVE-2021-22353?

CVE-2021-22353 has a CVSS score of 7.5 (HIGH). This CVE describes a memory buffer operation limit vulnerability in Huawei smartphone kernels. Successful exploitation could cause kernel panics and device restarts. Affected users are those with vulnerable Huawei smartphone models running unpatched firmware.

📋 TL;DR

This CVE describes a memory buffer operation limit vulnerability in Huawei smartphone kernels. Successful exploitation could cause kernel panics and device restarts. Affected users are those with vulnerable Huawei smartphone models running unpatched firmware.

💻 Affected Systems

Products:

Huawei smartphones

Versions: Specific versions not detailed in provided references; likely multiple EMUI versions prior to May 2021 patches.

Operating Systems: Android with Huawei EMUI

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability exists in Huawei's kernel implementation; exact models not specified in provided references.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Persistent denial of service through repeated kernel crashes, potentially leading to device instability and data corruption.

🟠

Likely Case

Temporary device unavailability due to kernel restart, requiring manual reboot to restore functionality.

🟢

If Mitigated

No impact if patched; limited disruption if proper monitoring and recovery procedures are in place.

🌐 Internet-Facing: LOW - This appears to be a local vulnerability requiring physical access or local code execution.

🏢 Internal Only: MEDIUM - Could be exploited by malicious apps or users with local access to cause service disruption.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation likely requires local code execution or malicious app installation; no public exploit details available.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: May 2021 security update

Vendor Advisory: https://consumer.huawei.com/en/support/bulletin/2021/5/

Restart Required: Yes

Instructions:

1. Check for updates in Settings > System & updates > Software update. 2. Install May 2021 security update. 3. Reboot device after installation.

🔧 Temporary Workarounds

Restrict app installations

all

Only install apps from trusted sources like Google Play Store or Huawei AppGallery to reduce attack surface.

Disable developer options

all

Turn off USB debugging and developer options if not needed to prevent local exploitation vectors.

🧯 If You Can't Patch

Isolate vulnerable devices from critical networks and functions
Implement strict app installation policies and monitor for unusual device behavior

🔍 How to Verify

Check if Vulnerable:

Check Settings > About phone > Build number and compare with Huawei's May 2021 security bulletin.

Check Version:

adb shell getprop ro.build.version.emui (for connected devices)

Verify Fix Applied:

Verify device has May 2021 or later security patch installed in Settings > Security > Security update.

📡 Detection & Monitoring

Log Indicators:

Kernel panic logs
Unexpected device reboots
Watchdog timeout messages

Network Indicators:

Device disconnections from MDM/EMM systems
Irregular heartbeat signals

SIEM Query:

Device logs containing 'kernel panic', 'watchdog', or 'unexpected restart' for Huawei devices

📊 Metadata

CVE ID: CVE-2021-22353

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

CWE: CWE-416

Published: June 30, 2021

Last Updated: November 21, 2024

🔗 References

https://consumer.huawei.com/en/support/bulletin/2021/5/ Vendor Advisory
https://consumer.huawei.com/en/support/bulletin/2021/5/ Vendor Advisory

📤 Share & Export

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