CVE-2025-27034

Q: What is the severity of CVE-2025-27034?

CVE-2025-27034 has a CVSS score of 9.8 (CRITICAL). This vulnerability allows memory corruption during PLMN selection from the SOR failed list in Qualcomm chipsets, potentially enabling remote code execution. It affects devices using vulnerable Qualcomm modem/baseband firmware. Attackers could exploit this to gain control over affected mobile devices.

9.8 CRITICAL

Remote Code Execution

📋 TL;DR

This vulnerability allows memory corruption during PLMN selection from the SOR failed list in Qualcomm chipsets, potentially enabling remote code execution. It affects devices using vulnerable Qualcomm modem/baseband firmware. Attackers could exploit this to gain control over affected mobile devices.

💻 Affected Systems

Products:

Qualcomm chipsets with cellular modem functionality

Versions: Specific firmware versions listed in Qualcomm September 2025 security bulletin

Operating Systems: Android, other mobile OS using Qualcomm chipsets

Default Config Vulnerable: ⚠️ Yes

Notes: Affects devices with vulnerable Qualcomm modem/baseband firmware; exact device models depend on OEM implementation.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution with kernel/system privileges leading to complete device compromise, data theft, and persistent backdoor installation.

🟠

Likely Case

Device crash/reboot (DoS) or limited code execution in modem/baseband context, potentially enabling interception of cellular communications.

🟢

If Mitigated

Device remains stable with no exploitation due to network segmentation and proper security controls.

🌐 Internet-Facing: HIGH - Exploitable via cellular network protocols without user interaction.

🏢 Internal Only: LOW - Requires cellular network access; not exploitable via internal enterprise networks alone.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires cellular network access and knowledge of modem/baseband internals; CVSS 9.8 suggests high exploitability.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware updates specified in Qualcomm September 2025 security bulletin

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

Restart Required: Yes

Instructions:

1. Check Qualcomm advisory for affected chipset/firmware versions. 2. Contact device OEM for firmware updates. 3. Apply firmware update via OEM-provided method. 4. Reboot device after update.

🔧 Temporary Workarounds

Disable vulnerable cellular features

all

Disable automatic network selection and use manual network mode if supported

Network segmentation

all

Restrict cellular network access to trusted carriers only

🧯 If You Can't Patch

Isolate affected devices from critical networks and sensitive data
Implement network monitoring for unusual cellular traffic patterns

🔍 How to Verify

Check if Vulnerable:

Check device modem/baseband firmware version against Qualcomm advisory; use Android commands like 'getprop | grep version.baseband' or device-specific OEM tools.

Check Version:

Android: 'getprop | grep version.baseband' or OEM-specific diagnostic tools

Verify Fix Applied:

Verify modem/baseband firmware version matches patched version from OEM update; check for absence of crashes in modem logs.

📡 Detection & Monitoring

Log Indicators:

Modem/baseband crash logs
Unexpected PLMN selection failures
Memory corruption errors in modem logs

Network Indicators:

Unusual cellular network signaling patterns
Anomalous PLMN selection attempts

SIEM Query:

Search for modem crash events, baseband errors, or PLMN selection anomalies in device logs

📊 Metadata

CVE ID: CVE-2025-27034

CVSS v3 Score: 9.8 (CRITICAL)

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

CWE: CWE-129

EPSS Score: 0.04% exploit probability (12.6th percentile)

Published: September 24, 2025

Last Updated: November 28, 2025

🔗 References

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

📋 TL;DR

💻 Affected Systems

📦 What is this software?

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Fastconnect 6700 Firmware by Qualcomm

Fastconnect 6800 Firmware by Qualcomm

Fastconnect 6900 Firmware by Qualcomm

Fastconnect 7800 Firmware by Qualcomm

Qca6174a Firmware by Qualcomm

Qca6391 Firmware by Qualcomm

Qca6574a Firmware by Qualcomm

Qca6584au Firmware by Qualcomm

Qca6595au Firmware by Qualcomm

Qca6696 Firmware by Qualcomm

Qca6698aq Firmware by Qualcomm

Qca8081 Firmware by Qualcomm

Qca8337 Firmware by Qualcomm

Qcc710 Firmware by Qualcomm

Qcm4490 Firmware by Qualcomm

Qcm5430 Firmware by Qualcomm

Qcm6490 Firmware by Qualcomm

Qcm8550 Firmware by Qualcomm

Qcn6024 Firmware by Qualcomm

Qcn6224 Firmware by Qualcomm

Qcn6274 Firmware by Qualcomm

Qcn9024 Firmware by Qualcomm

Qcs4490 Firmware by Qualcomm

Qcs5430 Firmware by Qualcomm

Qcs6490 Firmware by Qualcomm

Qcs8550 Firmware by Qualcomm

Qep8111 Firmware by Qualcomm

Qfw7114 Firmware by Qualcomm

Qfw7124 Firmware by Qualcomm

Sd 8 Gen1 5g Firmware by Qualcomm

Sdx55 Firmware by Qualcomm

Sdx57m Firmware by Qualcomm

Sdx61 Firmware by Qualcomm

Sdx71m Firmware by Qualcomm

Sdx80m Firmware by Qualcomm

Sg8275p Firmware by Qualcomm

Sm4635 Firmware by Qualcomm

Sm6650 Firmware by Qualcomm

Sm7250p Firmware by Qualcomm

Sm7325p Firmware by Qualcomm

Sm7635 Firmware by Qualcomm

Sm7675 Firmware by Qualcomm

Sm7675p Firmware by Qualcomm

Sm8550p Firmware by Qualcomm

Sm8635 Firmware by Qualcomm

Sm8635p Firmware by Qualcomm

Sm8650q Firmware by Qualcomm

Sm8750 Firmware by Qualcomm

Sm8750p Firmware by Qualcomm

Snapdragon 4 Gen 1 Mobile Platform Firmware by Qualcomm

Snapdragon 480 5g Mobile Platform Firmware by Qualcomm

Snapdragon 480\+ 5g Mobile Platform \(sm4350 Ac\) Firmware by Qualcomm

Snapdragon 690 5g Mobile Platform Firmware by Qualcomm

Snapdragon 695 5g Mobile Platform Firmware by Qualcomm

Snapdragon 765 5g Mobile Platform \(sm7250 Aa\) Firmware by Qualcomm

Snapdragon 765g 5g Mobile Platform \(sm7250 Ab\) Firmware by Qualcomm

Snapdragon 768g 5g Mobile Platform \(sm7250 Ac\) Firmware by Qualcomm

Snapdragon 778g 5g Mobile Platform Firmware by Qualcomm

Snapdragon 778g\+ 5g Mobile Platform \(sm7325 Ae\) Firmware by Qualcomm

Snapdragon 780g 5g Mobile Platform Firmware by Qualcomm

Snapdragon 782g Mobile Platform \(sm7325 Af\) Firmware by Qualcomm

Snapdragon 7c\+ Gen 3 Compute Firmware by Qualcomm

Snapdragon 8 Gen 1 Mobile Platform Firmware by Qualcomm

Snapdragon 8 Gen 1 Mobile Platform Firmware by Qualcomm

Snapdragon 8 Gen 2 Mobile Platform Firmware by Qualcomm

Snapdragon 8 Gen 2 Mobile Platform Firmware by Qualcomm

Snapdragon 8 Gen 3 Mobile Platform Firmware by Qualcomm

Snapdragon 865 5g Mobile Platform Firmware by Qualcomm

Snapdragon 865\+ 5g Mobile Platform \(sm8250 Ab\) Firmware by Qualcomm

Snapdragon 870 5g Mobile Platform \(sm8250 Ac\) Firmware by Qualcomm

Snapdragon 888 5g Mobile Platform Firmware by Qualcomm

Snapdragon 888\+ 5g Mobile Platform \(sm8350 Ac\) Firmware by Qualcomm

Snapdragon Auto 5g Modem Rf Firmware by Qualcomm

Snapdragon Auto 5g Modem Rf Gen 2 Firmware by Qualcomm