CVE-2023-40038Public exploit

Unauthorized wireless access via predictable default keys

Published Dec 27, 2023 · Updated Aug 2, 2024

Predictable WPA2 keys in Arris DG860A and DG1670A devices allow physically proximate attackers to gain unauthorized wireless access. The default-key generator combines the first six SSID characters with the last six BSSID characters after decrementing the final digit. An unchanged factory key and proximity to the Wi-Fi signal expose network access after passive beacon-frame observation.

CVSS severity8.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Predictable WPA2 keys in Arris DG860A and DG1670A devices allow physically proximate attackers to gain unauthorized wireless access. The default-key generator combines the first six SSID characters with the last six BSSID characters after decrementing the final digit. An unchanged factory key and proximity to the Wi-Fi signal expose network access after passive beacon-frame observation.

The record

CVE
CVE-2023-40038
Published
Dec 27, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1392, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1392Use of Default Credentials
T1040Network Sniffing

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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