CVE-2025-29520: Incorrect access control in the Maintenance module of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.2021123

This week

MEDIUM 5.3REMOTEMITIGATE

CVE-2025-29520 is a medium-severity flaw (CVSS 5.3) affecting dsl-7740c firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-284
Published	2025-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-25 15:15 UTCPublished CVE record published
2026-06-17 09:05 UTCUpdated Record last modified

dlink dsl-7740c firmware MITIGATE

Affected: 6.tr069.20211230

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.tr069.20211230

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-29520?

dsl-7740c firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-29520 being exploited?

CVE-2025-29520 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-29520 affect?

CVE-2025-29520 affects dsl-7740c firmware. Severity is medium (CVSS 5.3). 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 escalat

How urgent is CVE-2025-29520?

Priority 40/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-29523 HIGH 7.2 MITIGATE D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 was discovered to contain a command injection vulner
CVE-2025-29522 MEDIUM 6.5 MITIGATE D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 was discovered to contain a command injection vulner
CVE-2025-29521 MEDIUM 5.3 MITIGATE Insecure default credentials for the Adminsitrator account of D-Link DSL-7740C with firmware DSL7740C.V6.TR069
CVE-2025-29519 MEDIUM 5.3 MITIGATE A command injection vulnerability in the EXE parameter of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.202
CVE-2025-29517 MEDIUM 6.8 MITIGATE D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 was discovered to contain a command injection vulner

References

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