Overview
CVE-2025-61618 is a high-severity vulnerability affecting nr modems. This vulnerability stems from improper input validation, which can be exploited by remote attackers to trigger a system crash, leading to a denial-of-service (DoS) condition. No additional execution privileges are required to exploit this vulnerability.
Technical Details
The root cause of CVE-2025-61618 lies in the inadequate validation of input data processed by the nr modem. Specifically, a malformed or unexpectedly large input can cause the modem’s processing logic to enter an unhandled state, leading to a system crash. The specific input vector and impacted function are detailed in the vendor’s advisory (see references), but generally involve network packets received and processed by the modem.
CVSS Analysis
This vulnerability has been assigned a CVSS score of 7.5, indicating a high severity. The CVSS vector likely includes factors such as:
- Attack Vector: Network (AV:N) – The vulnerability can be exploited remotely over a network.
- Attack Complexity: Low (AC:L) – The vulnerability is relatively easy to exploit.
- Privileges Required: None (PR:N) – No privileges are required to exploit the vulnerability.
- User Interaction: None (UI:N) – No user interaction is required to exploit the vulnerability.
- Scope: Changed (S:C) – An attacker can cause an effect beyond the vulnerable component.
- Confidentiality Impact: None (C:N) – There is no confidentiality impact.
- Integrity Impact: None (I:N) – There is no integrity impact.
- Availability Impact: High (A:H) – The vulnerability can cause a complete denial of service.
Given the potential for remote exploitation and the high availability impact, this vulnerability poses a significant risk.
Possible Impact
Successful exploitation of CVE-2025-61618 can lead to the following:
- Denial of Service (DoS): The primary impact is a system crash, rendering the affected device unusable.
- Service Interruption: Devices relying on the nr modem for network connectivity will experience service interruptions.
- Potential for Chained Attacks: While the vulnerability itself is a DoS, it could be a component in a more complex attack chain.
Mitigation or Patch Steps
The primary mitigation strategy is to apply the security patch provided by the vendor. Specifically:
- Apply the Official Patch: Check the device manufacturer or Unisoc website for the latest firmware updates that address CVE-2025-61618.
- Monitor for Exploitation Attempts: Implement network monitoring and intrusion detection systems to identify and block potential exploitation attempts.
- Network Segmentation: Where possible, isolate devices utilizing the nr modem to limit the potential impact of a successful attack.
It’s crucial to prioritize patching to mitigate the risk associated with this vulnerability.
