CVE-2022-33270
📋 TL;DR
This vulnerability is a time-of-check time-of-use (TOCTOU) race condition in Qualcomm modem firmware that allows a transient denial-of-service (DoS) attack when processing RRC Reconfiguration messages. Attackers can exploit this to cause temporary service disruption on affected mobile devices. This affects devices using vulnerable Qualcomm modem chipsets.
💻 Affected Systems
- Qualcomm modem chipsets
📦 What is this software?
Snapdragon Auto 5g Modem Rf Firmware by Qualcomm
View all CVEs affecting Snapdragon Auto 5g Modem Rf Firmware →
Snapdragon X65 5g Modem Rf System Firmware by Qualcomm
View all CVEs affecting Snapdragon X65 5g Modem Rf System Firmware →
⚠️ Risk & Real-World Impact
Worst Case
Complete loss of cellular connectivity requiring device reboot, potentially affecting emergency services access.
Likely Case
Temporary cellular service disruption (dropped calls, failed data connections) lasting until modem resets.
If Mitigated
Minimal impact with proper network segmentation and monitoring; service automatically recovers after modem reset.
🎯 Exploit Status
Exploitation requires sending specially crafted RRC Reconfiguration messages via cellular interface; timing precision needed for race condition.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to April 2023 Qualcomm security bulletin for specific patched versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/april-2023-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply Qualcomm modem firmware updates from device OEM. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Network filtering
allImplement network-level filtering of suspicious RRC messages
🧯 If You Can't Patch
- Monitor for cellular service disruptions and investigate root causes
- Implement device isolation policies for affected devices in critical environments
🔍 How to Verify
Check if Vulnerable:
Check device modem firmware version against Qualcomm security bulletin; contact device manufacturer for vulnerability status.Check Version:
Device-specific commands vary by manufacturer; typically in Settings > About Phone > Baseband VersionVerify Fix Applied:
Verify modem firmware version has been updated to patched version specified in Qualcomm bulletin.📡 Detection & Monitoring
Log Indicators:
- Unexpected modem resets
- RRC connection failures
- Baseband processor crashes
Network Indicators:
- Abnormal RRC Reconfiguration message patterns
- Sudden cellular connection drops
SIEM Query:
Search for modem/baseband crash events or cellular connection failure patterns in device logs