Qualcomm Modem Flaws CVE-2025-21483, 27034 Rated 9.8

Qualcomm has disclosed two critical vulnerabilities in its latest September 2025 Security Bulletin, highlighting severe issues in modem components used across mobile and automotive platforms. Identified as CVE-2025-21483 and CVE-2025-27034, both flaws carry a CVSS score of 9.8, indicating maximum severity. These Qualcomm modem flaws present significant security risks, potentially exposing affected devices to remote code execution or unauthorized access.

The bulletin outlines dozens of vulnerabilities across Qualcomm’s chipsets and connectivity stacks, but CVE-2025-21483 and CVE-2025-27034 stand out due to their potential impact. Security researchers emphasize the urgency of patching these Qualcomm modem flaws to prevent exploitation, particularly in high-risk environments like connected vehicles and critical mobile infrastructure.

Qualcomm urges vendors and developers to apply available patches immediately. Organizations using affected hardware should verify deployments and prioritize remediation steps without delay.

For a detailed breakdown of the vulnerabilities, read the full report at

Critical CVE-2025-21483 & CVE-2025-27034 in Qualcomm Modems Score CVSS 9.8