CVE-2023-39086Network attack vector

Sensitive information disclosure via cleartext transmission

Published Aug 8, 2023 · Updated Jul 9, 2026

Cleartext transmission in ASUS RT-AC66U B1 3.0.0.4.286_51665 allows attackers to read sensitive information over the network. The public CVE record does not identify the affected protocol, data fields, or code path that sends the information without encryption. Exposure requires access to the relevant network traffic; integrity and availability effects are not reported.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in ASUS RT-AC66U B1 3.0.0.4.286_51665 allows attackers to read sensitive information over the network. The public CVE record does not identify the affected protocol, data fields, or code path that sends the information without encryption. Exposure requires access to the relevant network traffic; integrity and availability effects are not reported.

The record

CVE
CVE-2023-39086
Published
Aug 8, 2023
Updated
Jul 9, 2026
Vendor
ASUSTeK Computer Inc.
Product
RT-AC66U B1
Classifications
CWE-319, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 8, 2023CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.0.4.286_51665

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ASUSTeK Computer Inc. · RT-AC66U B1version=3.0.0.4.286_51665

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-319Cleartext Transmission of Sensitive Information
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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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