AUGUST 4, 2026
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Case File

CVE-2021-25681

HIGH · CVSS 7.5 EPSS 10.79% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-04-20 · Last synced 2026-08-04

CyberRota Analysis

This is a high severity vulnerability with a CVSS score of 7.5. Public exploit code or proof-of-concept references have been detected in its references. Its EPSS score suggests a 10.8% probability of exploitation in the next 30 days.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
External Security References

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-25681
Severity
HIGH
CVSS
7.5
EPSS
10.79%

Original NVD 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.

Related CVEs

Other vulnerabilities affecting the same vendor(s)