What is CVE-2021-1977?

CVE-2021-1977 is a high-severity vulnerability in Qualcomm Apq8009, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-10-20.

How severe is CVE-2021-1977?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-1977 known to be exploited?

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

Out-of-bounds Read in Qualcomm Apq8009

CVE-2021-1977

Possible buffer over read due to improper validation of frame length while processing AEAD decryption during ASSOC response in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon IoT, Snapdragon Mobile, Snapdragon Voice & Music

Vulnerability class: Buffer Overflow

Published 2021-10-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.4th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 47.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

References

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

Frequently asked questions

What is CVE-2021-1977?: CVE-2021-1977 is a high-severity vulnerability in Qualcomm Apq8009, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2021-10-20.
How severe is CVE-2021-1977?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-1977 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.