What is CVE-2023-40039?

CVE-2023-40039 is a critical-severity vulnerability in Arris Tg1672g, classified under Improper Access Control. CVSS score: 9.8/10. Published 2023-09-11.

How severe is CVE-2023-40039?

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

Is CVE-2023-40039 known to be exploited?

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

Vulnerability in Arris Tg1672g

CVE-2023-40039

An issue was discovered on ARRIS TG852G, TG862G, and TG1672G devices. A remote attacker (in proximity to a Wi-Fi network) can derive the default WPA2-PSK value by observing a beacon frame.

Published 2023-09-11 · 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 (67.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.012 · change: +0.003

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

Public proof-of-concept exploits

actuator/cve

References

i.ebayimg.com/images/g/-UcAAOSwDe1kyD-Z/s-l1600.png (Product)
i.ebayimg.com/images/g/4P0AAOSwdhxkrZtt/s-l1600.jpg (Product)
github.com/actuator/cve/blob/main/Arris/CVE-2023-40039 (Third Party Advisory)

Frequently asked questions

What is CVE-2023-40039?: CVE-2023-40039 is a critical-severity vulnerability in Arris Tg1672g, classified under Improper Access Control. CVSS score: 9.8/10. Published 2023-09-11.
How severe is CVE-2023-40039?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2023-40039 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.