CVE-2021-25679Public exploitNetwork attack vector

Session hijacking via unsanitized email address fields

Published Apr 20, 2021 · Updated Jul 9, 2026

Stored XSS in Adtran Personal Phone Manager 10.8.1 allows remote authenticated users to execute script in another user's browser. The change-email-address form stores the emailAddress and emailAddress2 POST values and later renders them as HTML without sanitization. Valid credentials are required to submit a payload, and a second user must view the stored value before script can steal a session or modify that user's settings.

CVSS severity5.4
Medium
EPSS probability2.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Adtran Personal Phone Manager 10.8.1 allows remote authenticated users to execute script in another user's browser. The change-email-address form stores the emailAddress and emailAddress2 POST values and later renders them as HTML without sanitization. Valid credentials are required to submit a payload, and a second user must view the stored value before script can steal a session or modify that user's settings.

The record

CVE
CVE-2021-25679
Published
Apr 20, 2021
Updated
Jul 9, 2026
Vendor
Adtran
Product
Personal Phone Manager
Classifications
CWE-79, T1056.002, T1539
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Adtran · Personal Phone Managerversion=*

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1056.002Input Capture: Keylogging
T1539Steal Web Session Cookie

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo