CVE-2021-25681

Name: CVE-2021-25681
Creator: NVD / NIST
Published: 2021-04-20T12:15:13.29+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 13.42%

Last modified Jun 17, 2026

CVE-2021-25681 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 13.42% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

13.42%

95.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Adtran	Personal Phone Manager	10.8.1

References

http://adtran.comVendor Advisory
http://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.mdExploit, Third Party Advisory
http://adtran.comVendor Advisory
http://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.mdExploit, Third Party Advisory

Timeline

Published: Apr 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-25681?

How severe is CVE-2021-25681?

CVE-2021-25681 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 13.42% probability of exploitation in the next 30 days.

How do I fix CVE-2021-25681?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-25681?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST