What is CVE-2023-28540?

CVE-2023-28540 is a critical-severity vulnerability in Qualcomm 315 5g Iot Modem, classified under Improper Authentication. CVSS score: 9.1/10. Published 2023-10-03.

How severe is CVE-2023-28540?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2023-28540 known to be exploited?

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

Auth bypass in Qualcomm 315 5g Iot Modem

CVE-2023-28540

Cryptographic issue in Data Modem due to improper authentication during TLS handshake.

Vulnerability class: Broken Authentication

Published 2023-10-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (34.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.qualcomm.com/company/product-security/bulletins/october-2023-bulletin (Vendor Advisory)

Frequently asked questions

What is CVE-2023-28540?: CVE-2023-28540 is a critical-severity vulnerability in Qualcomm 315 5g Iot Modem, classified under Improper Authentication. CVSS score: 9.1/10. Published 2023-10-03.
How severe is CVE-2023-28540?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2023-28540 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.