Overview
CVE-2025-61619 describes a high-severity vulnerability found in NR (New Radio) modems. This vulnerability stems from improper input validation and can be exploited to cause a system crash, leading to a remote denial-of-service (DoS) condition. Critically, exploitation requires no additional execution privileges.
Technical Details
The vulnerability lies within the NR modem’s processing of specific input data. Due to insufficient validation of this input, a crafted malicious input can trigger an unhandled exception or error condition within the modem’s firmware. This, in turn, results in a system crash and the subsequent denial of service. The specific nature of the vulnerable input and the affected code sections are detailed in the vendor’s security announcement.
CVSS Analysis
- Severity: HIGH
- CVSS Score: 7.5
A CVSS score of 7.5 indicates a significant threat level. While the exact vector string isn’t provided, the high score suggests that the vulnerability is remotely exploitable and has a considerable impact on availability.
Possible Impact
The successful exploitation of CVE-2025-61619 can lead to the following:
- Denial of Service (DoS): Affected devices (e.g., smartphones, IoT devices using the vulnerable NR modem) become unusable due to the modem crash.
- Network Disruption: Widespread exploitation could potentially disrupt network services relying on devices using the vulnerable modem.
- Battery Drain: Repeated modem crashes can lead to excessive battery consumption.
Mitigation or Patch Steps
The primary mitigation for CVE-2025-61619 is to apply the security patch provided by the modem vendor. Users should:
- Check for Updates: Regularly check for and install firmware updates for their devices.
- Contact Device Manufacturer: If no updates are available, contact the device manufacturer to inquire about the availability of a patch.
- Monitor Vendor Announcements: Stay informed about security advisories from the modem vendor (Unisoc in this case) and device manufacturers.
