What is CVE-2026-21384?

CVE-2026-21384 is a medium-severity vulnerability in Qualcomm Fastconnect 6700, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-07-06.

How severe is CVE-2026-21384?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Qualcomm Fastconnect 6700

CVE-2026-21384

Memory Corruption when updating prepared commands with invalid port indices based on user space input exceeds supported read client limits.

Vulnerability class: Buffer Overflow

EPSS: 0.001 (0.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L.

Affected products

Qualcomm Fastconnect_6700
Qualcomm Fastconnect_6700_firmware
Qualcomm Fastconnect_6900
Qualcomm Fastconnect_6900_firmware
Qualcomm Fastconnect_7800
Qualcomm Fastconnect_7800_firmware
Qualcomm Lemansau
Qualcomm Lemansau_firmware
Qualcomm Lemans_au_lgit
Qualcomm Lemans_au_lgit_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

product-security@qualcomm.com (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21384?: CVE-2026-21384 is a medium-severity vulnerability in Qualcomm Fastconnect 6700, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-07-06.
How severe is CVE-2026-21384?: Medium severity. CVSS v3 base score is 5.3 out of 10.