CVE-2025-29521Public exploitNetwork attack vector

Administrator access via predictable default credentials

Published Aug 25, 2025 · Updated Aug 26, 2025

Use of default credentials in D-Link DSL-7740C firmware DSL7740C.V6.TR069.20211230 allows remote attackers to access the Administrator account. The affected build retains default credentials on that account, so repeated login attempts can discover credentials accepted by the management interface. Network access to the interface is required; published impact is limited to unauthorized access and potential disclosure, with no documented data modification or service interruption.

CVSS severity5.3
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of default credentials in D-Link DSL-7740C firmware DSL7740C.V6.TR069.20211230 allows remote attackers to access the Administrator account. The affected build retains default credentials on that account, so repeated login attempts can discover credentials accepted by the management interface. Network access to the interface is required; published impact is limited to unauthorized access and potential disclosure, with no documented data modification or service interruption.

The record

CVE
CVE-2025-29521
Published
Aug 25, 2025
Updated
Aug 26, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1392, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1392Use of Default Credentials
T1110Brute Force

Public exploit references

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

Technologies

Your stack

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Your stack

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