What is CVE-2025-21476?

CVE-2025-21476 is a high-severity vulnerability in Qualcomm Qca6391, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2025-09-24.

How severe is CVE-2025-21476?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Qualcomm Qca6391

CVE-2025-21476

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

Vulnerability class: Buffer Overflow

EPSS: 0.001 (0.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Qualcomm Qca6391
Qualcomm Qca6391_firmware
Qualcomm Qca6698aq
Qualcomm Qca6698aq_firmware
Qualcomm Qcm5430
Qualcomm Qcm5430_firmware
Qualcomm Qcm6490
Qualcomm Qcm6490_firmware
Qualcomm Qcm8550
Qualcomm Qcm8550_firmware

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

product-security@qualcomm.com (Vendor Advisory)

Frequently asked questions

What is CVE-2025-21476?: CVE-2025-21476 is a high-severity vulnerability in Qualcomm Qca6391, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2025-09-24.
How severe is CVE-2025-21476?: High severity. CVSS v3 base score is 7.8 out of 10.