What is CVE-2026-21370?

CVE-2026-21370 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-2026-21370?

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

Buffer overflow in Qualcomm Fastconnect 6700

CVE-2026-21370

Memory Corruption when validating input batch size and buffer plane count exceeds maximum allowed values.

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 G3x_gen_2
Qualcomm G3x_gen_2_firmware
Qualcomm Iq-9075
Qualcomm Iq-9075_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

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

Frequently asked questions

What is CVE-2026-21370?: CVE-2026-21370 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-2026-21370?: Medium severity. CVSS v3 base score is 5.3 out of 10.