CVE-2025-29520: dsl-7740c Access Control Flaw — Exploit

Description

Incorrect access control in the Maintenance module of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 allows authenticated attackers with low-level privileges to arbitrarily change the high-privileged account passwords and escalate privileges.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-284 CWE-284

Affected Products

Vendor	Product	Versions
dlink	dsl-7740c_firmware	All
dlink	dsl-7740c	All

References

Advisories & Patches

https://www.dlink.com/en/security-bulletin/

Exploits

https://gist.github.com/stevenyu113228/da01c377030fd8c92274feca54661202

Frequently Asked Questions

What is CVE-2025-29520? +

Incorrect access control in the Maintenance module of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 allows authenticated attackers with low-level privileges to arbitrarily change the high-privileged account passwords and escalate privileges. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-29520? +

CVE-2025-29520 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-29520? +

CVE-2025-29520 affects products from dlink, specifically: dsl-7740c, dsl-7740c_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-29520? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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