CVE-2025-29515
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIncorrect access control in the DELT_file.xgi endpoint of D-Link DSL-7740C with firmware DSL7740C.V6.TR069.20211230 allows attackers to modify arbitrary settings within the device's XML database, including the administrator’s password.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceThe D-Link DSL-7740C router has an incorrect access control vulnerability in the DELT_file.xgi endpoint. This endpoint, intended for device configuration management via the TR-069 protocol, lacks proper authentication verification. Remote attackers can directly invoke this endpoint to modify the device's XML configuration database, allowing them to change the administrator password and other sensitive settings without any credentials.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 6.tr069.20211230CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm device model is D-Link DSL-7740CAccess the router's web interface or check the device label/metadata to verify the model number is DSL-7740CAffected if Device model is D-Link DSL-7740C and firmware version is 6.tr069.20211230
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Check firmware versionLog into the router web interface and look for firmware version in the status or system information page, or use command line tools like 'cat /proc/version' or 'nvram get firm_version' if SSH/telnet is availableAffected if Firmware version is exactly 6.tr069.20211230
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Verify TR-069 (CWMP) is enabledIn the router web interface, navigate to the TR-069 or WAN management settings (often under Advanced > WAN or Management > TR-069) and check if 'Enable TR-069' or 'CWMP' is turned onAffected if TR-069/CWMP remote management is enabled on the device
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Check if DELT_file.xgi endpoint is accessibleAttempt to access http://router_ip/DELT_file.xgi?something=1 from within the LAN, or verify the endpoint exists by checking the device's web server configurationAffected if The DELT_file.xgi endpoint responds without requiring authentication
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Check management interface exposureVerify router is accessible from WAN by attempting to access the web interface from an external IP, or check firewall/NAT rules on upstream devicesAffected if The router's management interface (port 80/443) is exposed directly to the WAN or internet
You are affected if you have a D-Link DSL-7740C router running firmware version 6.tr069.20211230 with TR-069/CWMP enabled and the DELT_file.xgi endpoint accessible without authentication.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataSince no patch is mentioned in the advisory, immediately restrict WAN access to the device's management interface using firewall rules, disable TR-069 remote management if not required, and contact D-Link for firmware updates. If unsupported, plan for device replacement.
- Consultation3.0 h
- Testing2.0 h
- Review / QA2.0 h
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-29515 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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