What is CVE-2020-11256?

CVE-2020-11256 is a high-severity vulnerability in Qualcomm Ar7420, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2021-06-09.

How severe is CVE-2020-11256?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2020-11256 known to be exploited?

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

Buffer overflow in Qualcomm Ar7420

CVE-2020-11256

Memory corruption due to lack of check of validation of pointer to buffer passed to trustzone in Snapdragon Wired Infrastructure and Networking

Vulnerability class: Buffer Overflow

Published 2021-06-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (6.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

n0-traces/cve_

References

www.qualcomm.com/company/product-security/bulletins/january-2021-bulletin (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2020-11256?: CVE-2020-11256 is a high-severity vulnerability in Qualcomm Ar7420, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.8/10. Published 2021-06-09.
How severe is CVE-2020-11256?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2020-11256 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.