{"cve":"CVE-2021-25681","nvd":{"published":"2021-04-20T12:15:13.290","modified":"2026-07-09T01:16:47.437","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","score":7.5},"cwes":[],"references":["http://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.html","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://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.md"],"products":["adtran:personal_phone_manager"],"source":"nvd","synced_at":"2026-10-19T21:17:01.373894544+00:00"},"epss":{"cve":"CVE-2021-25681","score":0.10879,"percentile":0.95862,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}