HOMEVULNERABILITIESCVE-2021-25681
HIGHPOC

CVE-2021-25681

NVD-CWE-noinfoPublished: April 20, 2021· Updated: Jul 9, 2026

7.5
CVSS v3.1

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.

NVD Source

Technical Analysis

CVE-2021-25681 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

A proof-of-concept (PoC) exploit exists for CVE-2021-25681. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

adtran3 product(s)
personal phone managernetvanta 7060netvanta 7100
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttp://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.html
ADVISORYhttps://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.md
ADVISORYhttp://packetstormsecurity.com/files/162280/Adtran-Personal-Phone-Manager-10.8.1-DNS-Exfiltration.html
ADVISORYhttps://github.com/3ndG4me/AdTran-Personal-Phone-Manager-Vulns/blob/main/CVE-2021-25681.md

All References (4)

→
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://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

Quick Facts

CVE IDCVE-2021-25681
CVSS Score7.5 / 10
SeverityHIGH
WeaknessNVD-CWE-noinfo
CISA KEVNo
ExploitPOC
Affected1 vendor(s)
PublishedApr 20, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2023-45894
10.0
CVE-2011-0807
10.0
CVE-2019-25136
10.0
CVE-2023-40455
10.0
CVE-2023-38586
10.0
CVE-2015-3042
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-25681 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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