What is CVE-2025-21426?

CVE-2025-21426 is a medium-severity vulnerability in Qualcomm Fastconnect 7800, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.6/10. Published 2025-07-08.

How severe is CVE-2025-21426?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Buffer overflow in Qualcomm Fastconnect 7800

CVE-2025-21426

Memory corruption while processing camera TPG write request.

Vulnerability class: Buffer Overflow

Published 2025-07-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L.

EPSS exploit prediction

EPSS: 0.001 (0.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 1st percentile — 0.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

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

References

docs.qualcomm.com/product/publicresources/securitybulletin/july-2025-bulletin.h… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-21426?: CVE-2025-21426 is a medium-severity vulnerability in Qualcomm Fastconnect 7800, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 6.6/10. Published 2025-07-08.
How severe is CVE-2025-21426?: Medium severity. CVSS v3 base score is 6.6 out of 10.