CVE-2021-25681 Information disclosure in n/a

High 7.5 Published 20 Apr 2021 Updated 9 Jul 2026

Attackers can exfiltrate data via DNS tunneling using exposed web servers in end-of-life AdTran phone manager appliances.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-25681?

CVE-2021-25681 is a high-severity vulnerability in n/a, published on 20 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2021-25681?

It affects 1 product.

Products include Adtran Personal Phone Manager.

How do I fix CVE-2021-25681?

No fix has been published for CVE-2021-25681 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-25681 being exploited?

There is no known exploitation of CVE-2021-25681 in the wild and no public exploit code.

Public exploit code: 1 Exploit-DB entry.

Sources

Also known as GHSA-rmmm-93q6-jw8j.