CVE-2025-43706
📋 TL;DR
A vulnerability in Samsung Exynos processors allows incorrect handling of RRC (Radio Resource Control) packets, leading to denial of service. This affects mobile devices, wearables, and modems using the listed Exynos chips. Attackers could disrupt cellular connectivity or device functionality.
💻 Affected Systems
- Samsung Mobile Processor Exynos 980
- Samsung Mobile Processor Exynos 990
- Samsung Mobile Processor Exynos 850
- Samsung Mobile Processor Exynos 1080
- Samsung Mobile Processor Exynos 2400
- Samsung Mobile Processor Exynos 1580
- Samsung Wearable Processor Exynos 9110
- Samsung Wearable Processor Exynos W920
- Samsung Wearable Processor Exynos W930
- Samsung Modem Exynos 5123
- Samsung Modem Exynos 5400
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete loss of cellular connectivity, device crashes, or persistent denial of service requiring physical intervention to restore functionality.
Likely Case
Temporary loss of cellular connectivity, dropped calls, or degraded network performance until the device recovers or reboots.
If Mitigated
Minimal impact with proper network segmentation and monitoring; isolated incidents affecting single devices rather than entire networks.
🎯 Exploit Status
Exploitation requires sending malformed RRC packets over cellular networks; attacker proximity or network access needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor-specific firmware updates
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-43706/
Restart Required: Yes
Instructions:
1. Check for firmware updates from device manufacturer. 2. Apply available security patches. 3. Reboot device after update.
🔧 Temporary Workarounds
Disable cellular when not needed
androidTurn off cellular data/voice when in trusted Wi-Fi environments to reduce attack surface
Settings > Connections > Mobile networks > Disable
🧯 If You Can't Patch
- Isolate affected devices on separate network segments
- Monitor for unusual cellular connectivity patterns or device crashes
🔍 How to Verify
Check if Vulnerable:
Check device specifications for affected Exynos chipset and firmware version against vendor advisoriesCheck Version:
Settings > About phone > Software information > Build numberVerify Fix Applied:
Verify firmware version matches or exceeds patched versions listed in Samsung security advisory📡 Detection & Monitoring
Log Indicators:
- Unexpected device reboots
- Cellular connection drops in system logs
- RRC protocol errors in modem logs
Network Indicators:
- Unusual RRC packet patterns
- Multiple devices losing cellular connectivity simultaneously
SIEM Query:
Device logs showing 'modem crash' OR 'RRC error' OR 'cellular disconnect' events