CVE-2022-25735
📋 TL;DR
CVE-2022-25735 is a denial-of-service vulnerability in Qualcomm modems where missing null pointer checks when processing TCP/UDP packets can cause crashes. This affects devices using vulnerable Qualcomm modem chipsets, primarily mobile devices and IoT equipment. Attackers can send specially crafted network packets to trigger the vulnerability.
💻 Affected Systems
- Qualcomm modem chipsets
- Devices using affected Qualcomm modems
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete modem crash requiring device reboot, disrupting all cellular connectivity including emergency calls and location services.
Likely Case
Temporary loss of cellular data/voice connectivity until modem resets, causing service disruption.
If Mitigated
Minimal impact with proper network filtering and updated firmware preventing exploitation.
🎯 Exploit Status
Exploitation requires sending specially crafted TCP/UDP packets to vulnerable modem interfaces.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Qualcomm February 2023 security bulletin for specific patched versions
Vendor Advisory: https://www.qualcomm.com/company/product-security/bulletins/february-2023-bulletin
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply Qualcomm modem firmware updates. 3. Reboot device after update. 4. Verify patch through version checking.
🔧 Temporary Workarounds
Network Traffic Filtering
allImplement network filtering to block suspicious TCP/UDP packets targeting modem interfaces
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices
- Deploy intrusion detection systems to monitor for DoS attempts against modem interfaces
🔍 How to Verify
Check if Vulnerable:
Check device modem firmware version against Qualcomm's patched versions in February 2023 bulletinCheck Version:
Device-specific commands vary by manufacturer; typically in device settings or diagnostic menusVerify Fix Applied:
Verify modem firmware has been updated to versions listed in Qualcomm's security bulletin📡 Detection & Monitoring
Log Indicators:
- Modem crash logs
- Unexpected modem resets
- Cellular connectivity loss events
Network Indicators:
- Unusual TCP/UDP packets targeting modem ports
- Patterns of packets causing modem instability
SIEM Query:
Search for modem crash events OR cellular interface resets within short timeframes