CVE-2025-27891
📋 TL;DR
A memory corruption vulnerability in Samsung Exynos processors allows attackers to perform out-of-bounds reads via malformed NAS packets. This affects Samsung mobile devices, wearables, and modems using the listed Exynos chips. Successful exploitation could lead to information disclosure or potentially remote code execution.
💻 Affected Systems
- Samsung Mobile Processor
- Samsung Wearable Processor
- Samsung Modem Exynos 980
- Exynos 990
- Exynos 850
- Exynos 1080
- Exynos 2100
- Exynos 1280
- Exynos 2200
- Exynos 1330
- Exynos 1380
- Exynos 1480
- Exynos 2400
- Exynos W920
- Exynos W930
- Exynos W1000
- Modem 5123
- Modem 5300
- Modem 5400
📦 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
Information disclosure through memory reads, potentially exposing sensitive data or facilitating further attacks.
If Mitigated
Limited impact with proper network segmentation and security controls in place.
🎯 Exploit Status
Exploitation requires sending malformed NAS packets to vulnerable devices.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor security updates
Vendor Advisory: https://semiconductor.samsung.com/support/quality-support/product-security-updates/cve-2025-27891/
Restart Required: Yes
Instructions:
1. Check for Samsung security updates. 2. Apply the latest firmware update. 3. Reboot device after installation.
🔧 Temporary Workarounds
Network filtering
allBlock or filter malformed NAS packets at network perimeter
🧯 If You Can't Patch
- Segment affected devices on isolated networks
- Implement strict network access controls and monitoring
🔍 How to Verify
Check if Vulnerable:
Check device model and chipset information in settings, then verify against Samsung's security advisory.Check Version:
Settings > About phone > Software information (Android) or equivalent on other platformsVerify Fix Applied:
Confirm installation of latest security patch and check patch level in device settings.📡 Detection & Monitoring
Log Indicators:
- Unusual NAS packet processing errors
- Memory access violations in system logs
Network Indicators:
- Malformed NAS packets targeting affected devices
- Unusual traffic patterns to/from mobile devices
SIEM Query:
Search for NAS protocol anomalies or memory access errors in device logs