This article provides an in-depth analysis of CVE-2025-20756, a significant vulnerability affecting modems that can lead to a remote denial-of-service (DoS) condition. We will delve into the technical details of the vulnerability, its potential impact, and the necessary steps to mitigate the risk.
Overview
CVE-2025-20756 describes a logic error present in certain modem implementations. This flaw allows a malicious actor, by controlling a rogue base station, to trigger a system crash on vulnerable devices connected to it. The exploitation requires no user interaction and doesn’t need any special privileges on the target device.
Technical Details
The vulnerability stems from a logic error (Issue ID: MSV-4643) within the modem’s processing of network communication. When a User Equipment (UE), such as a smartphone, connects to a malicious base station controlled by an attacker, the attacker can send specially crafted signals or data packets that exploit this logic error. The specific nature of the error is not detailed here but results in a system crash, effectively causing a denial of service. The provided Patch ID is MOLY01673749, suggesting the fix involves modifications to the modem’s software.
CVSS Analysis
The Common Vulnerability Scoring System (CVSS) score for CVE-2025-20756 is currently unavailable (N/A) as per the provided data. However, given the potential for remote denial of service without user interaction, a high severity rating would be anticipated. Further information will be added as it becomes available.
Possible Impact
The exploitation of CVE-2025-20756 has the following potential impacts:
- Denial of Service: The primary impact is a system crash, rendering the device unusable. This prevents the user from making calls, accessing data, and using other essential device functions.
- Widespread Disruption: A coordinated attack leveraging this vulnerability could potentially disrupt communication services across a wide area, particularly if many devices are simultaneously targeted by strategically placed rogue base stations.
- Battery Drain: Repeated crashes and restarts could lead to accelerated battery drain, further exacerbating the denial-of-service condition.
Mitigation and Patch Steps
The primary mitigation for CVE-2025-20756 is to apply the vendor-supplied patch. Here’s how:
- Identify Vulnerable Devices: Determine if your devices utilize modems affected by this vulnerability. Consult your device manufacturer or carrier for specific information.
- Apply the Patch: Apply the security patch identified as MOLY01673749. This will likely be delivered as a firmware update from your device manufacturer or mobile carrier. Ensure the update process is completed successfully.
- Security Awareness: Remain vigilant regarding potential threats, and report any suspicious network behavior to your carrier or security professionals.
