What is the CVSS score of CVE-2025-21476?

CVE-2025-21476 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Qca6391 Firmware are affected by CVE-2025-21476?

CVE-2025-21476 presents notable security risk, a buffer overflow vulnerability rated CVSS 7.8.

How to fix or mitigate CVE-2025-21476?

Within 30 days: Identify all affected systems and apply vendor patches as part of regular patch cycle. If patching is delayed, consider network segmentation to limit exposure.

Qca6391 Firmware CVE-2025-21476

HIGH

Classic Buffer Overflow (CWE-120)

2025-09-24 product-security@qualcomm.com

Buffer Overflow Qca6391 Firmware Qca6698aq Firmware Qcm5430 Firmware Qcm6490 Firmware Qcm8550 Firmware Qcn9011 Firmware Qcn9012 Firmware Qcn9274 Firmware Qcs5430 Firmware Qcs615 Firmware Qcs6490 Firmware Qcs8550 Firmware Qcs9100 Firmware Sg8275 Firmware Sg8275p Firmware Sm6650 Firmware Sm7635 Firmware Sm7675 Firmware Sm7675p Firmware Sm8550p Firmware Sm8635 Firmware Sm8635p Firmware Sm8650q Firmware Sm8750 Firmware Sm8750p Firmware Sxr2330p Firmware Wcn3910 Firmware Wcn3950 Firmware Wcn6650 Firmware Wcn6755 Firmware Wcn7860 Firmware Wcn7861 Firmware Wcn7880 Firmware Wcn7881 Firmware Sm8550 Firmware Sm8650 Firmware Sm8650P Firmware Wcn6750 Firmware Wcn6855 Firmware Wcn6856 Firmware Wcn7850 Firmware Wcn7851 Firmware

7.8

CVSS 3.1

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:13 vuln.today

CVE Published

Sep 24, 2025 - 16:15 nvd

HIGH 7.8

DescriptionNVD

Memory corruption when passing parameters to the Trusted Virtual Machine during the handshake.

AnalysisAI

Memory corruption when passing parameters to the Trusted Virtual Machine during the handshake. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. No vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Memory corruption when passing parameters to the Trusted Virtual Machine during the handshake. Affected products include: Qualcomm Qcs6490 Firmware, Qualcomm Qcs8550 Firmware, Qualcomm Qcs9100 Firmware, Qualcomm Sg8275 Firmware, Qualcomm Sg8275P Firmware.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.

CVE-2025-21476 vulnerability details – vuln.today

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Qca6391 Firmware CVE-2025-21476

CVSS VectorNVD

Lifecycle Timeline

DescriptionNVD

AnalysisAI

Technical ContextAI

RemediationAI

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External POC / Exploit Code