CVE-2025-47318 Overview
CVE-2025-47318 is a transient denial-of-service vulnerability affecting a broad range of Qualcomm chipsets and firmware. The flaw resides in the parsing logic for the Ethernet Packet Test Mode (EPTM) test control message used to retrieve the test pattern. An attacker on the network can trigger the condition without authentication or user interaction, causing affected components to enter a transient denial-of-service state. The issue is tracked under CWE-126: Buffer Over-read and impacts mobile platforms, automotive SoCs, FastConnect Wi-Fi, modem, and IoT firmware across the Snapdragon portfolio.
Critical Impact
Unauthenticated network-adjacent attackers can disrupt availability of affected Qualcomm components by sending a crafted EPTM test control message.
Affected Products
- Qualcomm Snapdragon mobile platforms (Snapdragon 8 Gen 1/2, 8+ Gen 2, 865/870/888, 778G)
- Qualcomm FastConnect 6200/6700/6800/6900/7800 and automotive SA-series firmware (SA8155P, SA8255P, SA8295P, SA8775P)
- Qualcomm modem and IoT firmware including SDX55, SDX61, QCN-series, QCA-series, and Snapdragon X55/X65/X72/X75 5G Modem-RF Systems
Discovery Timeline
- 2025-09-24 - CVE CVE-2025-47318 published to NVD
- 2025-11-28 - Last updated in NVD database
Technical Details for CVE-2025-47318
Vulnerability Analysis
The vulnerability occurs while the firmware parses an Ethernet Packet Test Mode (EPTM) test control message to extract the test pattern. Improper validation of length or boundary fields within the incoming message causes the parser to read beyond the bounds of an allocated buffer, classified under CWE-126: Buffer Over-read. The resulting fault produces a transient denial-of-service condition on the affected firmware component. Successful exploitation does not yield code execution or data exposure but disrupts availability of the targeted subsystem until it recovers or is reset. Because Qualcomm chipsets are embedded across mobile, automotive, compute, IoT, and infrastructure platforms, the issue has broad downstream exposure across consumer devices and managed fleets.
Root Cause
The root cause is missing or insufficient bounds checking on fields within the EPTM test control message before the parser dereferences memory to read the test pattern. When the message is malformed or contains attacker-controlled length values, the parser walks past the intended buffer, triggering a fault and crashing the handling component.
Attack Vector
The attack vector is network-based and requires no privileges or user interaction. An attacker delivers a crafted EPTM test control message to a vulnerable interface exposed by the Qualcomm firmware. The malformed message forces the parser into an out-of-bounds read, halting the targeted process. Repeated delivery can sustain the denial-of-service condition against the affected subsystem.
No public proof-of-concept code or exploit has been published for this issue. Refer to the Qualcomm Security Bulletin September 2025 for vendor technical guidance.
Detection Methods for CVE-2025-47318
Indicators of Compromise
- Unexpected restarts, hangs, or watchdog-triggered resets of Qualcomm subsystems handling Ethernet test traffic
- Repeated malformed EPTM test control frames observed on management or test interfaces
- Crash logs or kernel messages referencing the EPTM parser or test-pattern handling routines
Detection Strategies
- Inspect network telemetry for anomalous EPTM frames on interfaces where test mode should be disabled in production
- Correlate device crash telemetry with inbound network events targeting Ethernet management ports
- Enable vendor diagnostic logging on affected platforms to capture EPTM parser exceptions
Monitoring Recommendations
- Monitor uptime and reboot counters on devices built on the affected Qualcomm platforms
- Alert on repeated reception of EPTM control messages from untrusted segments
- Track Qualcomm advisory updates and firmware patch deployment status across managed fleets
How to Mitigate CVE-2025-47318
Immediate Actions Required
- Inventory all devices built on the affected Qualcomm chipsets listed in the September 2025 security bulletin
- Apply the Qualcomm-supplied firmware updates as soon as OEMs make them available for each platform
- Restrict exposure of Ethernet test and management interfaces to trusted network segments only
Patch Information
Qualcomm released fixes through the Qualcomm Security Bulletin September 2025. OEMs and integrators must redistribute the patched firmware through their device update channels. Coordinate with each platform vendor to confirm patch availability for specific Snapdragon, FastConnect, QCN, QCA, SA-series, and SDX-series components in use.
Workarounds
- Disable Ethernet Packet Test Mode (EPTM) functionality on production devices when not required
- Segment management and diagnostic networks from general-purpose and untrusted networks
- Enforce strict ingress filtering on interfaces that could receive crafted EPTM control frames
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
