CVE-2021-25681

HighCVSS 7.5

Published: 20/04/2021(UTC)Updated: 09/07/2026(UTC)Translated: 10/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Very high risk

10.79%

95th percentile - higher than 95% of all known CVEs

Summary

AdTran Personal Phone Manager 10.8.1 software is vulnerable to data exfiltration over DNS. Exposed web servers can be used as DNS redirectors to tunnel arbitrary data.

Risk Assessment

The risk involves potential leakage of sensitive organizational data through DNS tunneling, leading to confidentiality breaches.

Recommendation

Immediately decommission NetVanta 7060 and NetVanta 7100 appliances as they are End of Life and will not be patched. Replace with supported hardware.

Original NVD description (English source)

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.