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VulnerabilityPublished Updated

CVE-2024-39345: SmartOS · Use of Hard-coded Password

Affects SmartOSSource CVE Database V5

0

Not known to be exploited · CVSS 7.5 High : upgrade to 12.5.5.1 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 44% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 12.5.5.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jul 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade adtran/SmartOS to 12.5.5.1.

Affected software

ProductAffectedFixed in
GitHubadtran/SmartOSpkg:github/adtran/SmartOSOther threatsAffected
  • <12.5.5.1
Fixed in
  • 12.5.5.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

To mitigate CVE-2024-39345, organizations should immediately identify any AdTran 834-5 devices running SmartOS 11.1.1.1 or earlier versions. The primary remediation is to upgrade the device firmware to SmartOS 12.5.5.1 or later, where the vulnerability has been fixed. Until upgrades can be applied, network administrators should restrict access to the affected devices’ management interfaces by implementing strict network segmentation and firewall rules to limit SSH access only to trusted hosts. Disable SSH if it is not required. Change or disable any undocumented or support accounts if possible, or at least change their passwords to strong, non-predictable values. Monitor device logs and network traffic for unusual SSH login attempts or command execution. Employ network intrusion detection systems to detect anomalous behavior. Coordinate with AdTran support for any additional vendor-specific guidance. Avoid exposing these devices directly to untrusted networks or the internet. Regularly audit device configurations for hidden accounts or backdoors.

Description

AdTran 834-5 HDC17600021F1 (SmartOS 11.1.1.1) devices enable the SSH service by default and have a hidden, undocumented, hard-coded support account whose password is based on the devices MAC address. All of the devices internet interfaces share a similar MAC address that only varies in their final octet. This allows network-adjacent attackers to derive the support user's SSH password by decrementing the final octet of the connected gateway address or via the BSSID. An attacker can then execute arbitrary OS commands with root-level privileges. NOTE: The vendor states that there is no intended functionality allowing an attacker to execute arbitrary OS Commands with root-level privileges. The vendor also states that this issue was fixed in SmartOS 12.5.5.1.

References

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