What is CVE-2020-3686?

CVE-2020-3686 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-01-21.

How severe is CVE-2020-3686?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-3686 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Qualcomm Apq8009

CVE-2020-3686

Possible memory out of bound issue during music playback when an incorrect bit stream content is copied into array without checking the length of array in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

Vulnerability class: Buffer Overflow

Published 2021-01-21 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (66.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

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

Public proof-of-concept exploits

TinyNiko/android_

References

www.qualcomm.com/company/product-security/bulletins/december-2020-bulletin (Broken Link)
www.qualcomm.com/company/product-security/bulletins/december-2020-security-bull… (Vendor Advisory)

Frequently asked questions

What is CVE-2020-3686?: CVE-2020-3686 is a critical-severity vulnerability in Qualcomm Apq8009, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-01-21.
How severe is CVE-2020-3686?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-3686 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.