CVE-2025-27052

Q: What is the severity of CVE-2025-27052?

CVE-2025-27052 has a CVSS score of 7.8 (HIGH). This vulnerability allows memory corruption in the diag component when processing data packets from Unix clients. Attackers could potentially execute arbitrary code or cause denial of service on affected systems. This affects Qualcomm products using vulnerable diag implementations.

7.8 HIGH

📋 TL;DR

This vulnerability allows memory corruption in the diag component when processing data packets from Unix clients. Attackers could potentially execute arbitrary code or cause denial of service on affected systems. This affects Qualcomm products using vulnerable diag implementations.

💻 Affected Systems

Products:

Qualcomm chipsets with diag functionality

Versions: Specific versions not detailed in reference; check Qualcomm advisory for affected chipsets

Operating Systems: Android, Linux-based systems using Qualcomm chipsets

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability requires diag service to be enabled and accessible; many devices have this disabled by default in production

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation

🟠

Likely Case

Denial of service causing system crashes or instability in diagnostic services

🟢

If Mitigated

Limited impact with proper network segmentation and access controls preventing exploitation

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: HIGH

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires sending specially crafted packets to the diag service; complexity depends on specific memory layout and mitigations

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Check Qualcomm July 2025 security bulletin for specific chipset firmware versions

Vendor Advisory: https://docs.qualcomm.com/product/publicresources/securitybulletin/july-2025-bulletin.html

Restart Required: Yes

Instructions:

1. Check Qualcomm advisory for affected chipset models. 2. Obtain updated firmware from device manufacturer. 3. Apply firmware update following manufacturer instructions. 4. Reboot device to activate patch.

🔧 Temporary Workarounds

Disable diag service

android

Prevent exploitation by disabling the vulnerable diagnostic service

adb shell setprop persist.vendor.sys.usb.config diag,adb
adb shell setprop persist.vendor.sys.usb.config mtp,adb

Network segmentation

linux

Restrict access to diag service ports using firewall rules

iptables -A INPUT -p tcp --dport 5555 -j DROP
iptables -A INPUT -p udp --dport 5555 -j DROP

🧯 If You Can't Patch

Implement strict network access controls to isolate devices with diag services
Monitor for abnormal diag service activity and connection attempts

🔍 How to Verify

Check if Vulnerable:

Check if diag service is running and accessible: 'netstat -tulpn | grep :5555' or 'adb devices' showing unauthorized connections

Check Version:

adb shell getprop ro.bootloader or check device firmware version in settings

Verify Fix Applied:

Verify firmware version matches patched version from Qualcomm advisory and test diag service functionality

📡 Detection & Monitoring

Log Indicators:

Unexpected diag service restarts
Memory allocation failures in diag logs
Abnormal packet size in diag traffic

Network Indicators:

Unusual connections to diag port (typically 5555)
Malformed packets to diag service
Traffic from unexpected sources to diagnostic interfaces

SIEM Query:

source_port=5555 OR dest_port=5555 AND (packet_size>threshold OR protocol_violation=true)

📊 Metadata

CVE ID: CVE-2025-27052

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-120

EPSS Score: 0.02% exploit probability (4.1th percentile)

Published: July 8, 2025

Last Updated: August 11, 2025

🔗 References

https://docs.qualcomm.com/product/publicresources/securitybulletin/july-2025-bulletin.html Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

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