CVE-2024-39345Public exploit

Root command execution via MAC-derived SSH password

Published Jul 24, 2024 · Updated Sep 4, 2024

Authentication bypass in Adtran 834-5 Firmware before 12.5.5.1 allows network-adjacent attackers to execute root-level OS commands. The default-enabled SSH service accepts an undocumented support-account password derived from the device MAC address, whose last octet can be inferred from the gateway address or BSSID. Successful authentication opens a root-level shell; Adtran acknowledges the credential issue but disputes that intended functionality allows arbitrary root commands.

CVSS severity7.2
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Adtran 834-5 Firmware before 12.5.5.1 allows network-adjacent attackers to execute root-level OS commands. The default-enabled SSH service accepts an undocumented support-account password derived from the device MAC address, whose last octet can be inferred from the gateway address or BSSID. Successful authentication opens a root-level shell; Adtran acknowledges the credential issue but disputes that intended functionality allows arbitrary root commands.

The record

CVE
CVE-2024-39345
Published
Jul 24, 2024
Updated
Sep 4, 2024
Vendor
Adtran
Product
834-5 Firmware
Classifications
CWE-259, CWE-78, T1078.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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?

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

  1. Affected versionversion=11.1.1.1 <12.5.5.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Adtran · 834-5 Firmwareversion=11.1.1.1 <12.5.5.1

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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-259Use of Hard-coded Password
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1078.001Valid Accounts: Default Accounts

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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