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CVE-2021-25681

HighPublished

AdTran Personal Phone Manager 10.8.1 software is vulnerable to an issue that allows for exfiltration of data over DNS. This could allow for exposed AdTran...

Published: Apr 20, 2021
Updated: Jul 9, 2026
Assigning CNA: mitre
Evidence observed: Apr 21, 2021

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

10.9%

Moderate · next 30 days

Percentile: 95.7%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

AdTran Personal Phone Manager 10.8.1 software is vulnerable to an issue that allows for exfiltration of data over DNS. This could allow for exposed AdTran Personal Phone Manager web servers to be used as DNS redirectors to tunnel arbitrary data over DNS. NOTE: The affected appliances NetVanta 7060 and NetVanta 7100 are considered End of Life and as such this issue will not be patched.

Sources

AdTran-Personal-Phone-Manager-VulnsInformational
A repository hosting write ups for the 0 days CVE-2021-25679, CVE-2021-25680, and CVE-2021-25681
Adtran Personal Phone Manager 10.8.1 - DNS ExfiltrationExploit
3ndG4me · hardware · Apr 21, 2021

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