External risk intelligence

Samsung Exynos Wi-Fi Driver Buffer Overflow Vulnerability.

CVE advisorySeverity: CRITICAL (CVSS 9.8)

CVE-2025-52909

This vulnerability affects a Wi-Fi driver within specific mobile and wearable processors. Driver-level vulnerabilities in consumer mobile hardware components are typically localized to the device's own internal execution environment and are not exposed as internet-facing services, gateways, or web applications, making public internet reachability for this specific component extremely unlikely.

Buffer Overflow

Samsung Exynos W1000 Firmware

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A critical vulnerability has been identified in the Wi-Fi driver software found in several Samsung mobile and wearable processors. This issue could allow for unauthorized access and control over affected devices due to a buffer overflow vulnerability triggered by specific network commands. The exposure of this flaw is considered external, meaning it can be exploited over a network without direct user interaction.

A driver flaw can allow unauthorized device access.
Leadership should remember this impacts mobile and wearable tech.
Confirm relevance and exposure for affected devices.

Attack Path

How an attacker could exploit the issue

An attacker could reach this vulnerability through the network, requiring no special access or privileges. The issue lies within the Wi-Fi driver, specifically when handling vendor commands. Successfully triggering this vulnerability could allow an attacker to cause a buffer overflow, potentially leading to significant compromise of the device.

Network access required, no authentication needed.
Triggered via specific ioctl message to Wi-Fi driver.
Risk includes information disclosure and code execution.

Live Threat

Current exploitation, exposure, and threat context

The Wi-Fi driver in certain Samsung Exynos processors could be vulnerable to a buffer overflow when handling specific ioctl messages. This vulnerability could allow an attacker to impact the device's Wi-Fi functionality.

Device Wi-Fi functionality.
Via crafted ioctl messages.
Potential disruption of service.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in Samsung Exynos Wi-Fi drivers impacts mobile and wearable devices. Ownership likely falls to the device manufacturer's firmware team or the platform team responsible for integrating these processors, in coordination with the vendor management team for Samsung. The immediate first step is to identify all deployed Samsung devices utilizing the affected Exynos processors, confirm if these devices are exposed to external networks, and then prioritize remediation based on business criticality and potential exposure.

Device manufacturers own the vulnerability.
Confirm device exposure and criticality first.
Plan vendor-coordinated remediation.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is the Samsung Exynos Wi-Fi driver?

These are low-level software components responsible for managing wireless connectivity on Samsung mobile and wearable processors. They act as the bridge between the device's hardware chipsets—such as the Exynos 1280, 1380, 1480, or the W1000 wearable chip—and the operating system, facilitating data transmission over Wi-Fi networks.

What does CWE-120 mean for CVE-2025-52909?

CWE-120 refers to a buffer overflow weakness. In the context of this vulnerability, it means the Wi-Fi driver fails to properly verify the size of data before copying it into a fixed-length memory space. An attacker can use this to overwrite adjacent memory, potentially leading to unauthorized control or system instability.

How is this vulnerability triggered?

The flaw is triggered by sending a specially crafted ioctl message to the Wi-Fi driver. This occurs when the driver incorrectly handles a specific vendor command within the NL80211 protocol stack. It is not triggered by standard, legitimate Wi-Fi traffic, as it requires the specific malicious command sequence to cause the overflow.

Is my device at risk over the internet?

Halo Surface Signal indicates that while the vulnerability is classified as network-accessible, it is very unlikely to be exposed as an internet-facing service. These drivers operate within the device's local execution environment, making direct public-internet reachability for the Wi-Fi driver itself extremely rare compared to typical web applications.

What should I do if I have affected hardware?

Begin by auditing your device inventory to identify hardware running the listed Exynos processors. Since this is a firmware-level issue, remediation must be managed through official updates provided by the device manufacturer. Monitor the manufacturer's support channels for security patches specifically addressing this CVE.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.