dbcve.org
Command InjectionWeakness · CWE-77

CVE-2026-4627

HIGH · 7.2 CVSS v3.1 Published 2026-03-24
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable Zero-click

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 · unedited
A vulnerability was found in D-Link DIR-825 and DIR-825R 1.0.5/4.5.1. Affected is the function handler_update_system_time of the file libdeuteron_modules.so of the component NTP Service. The manipulation results in os command injection. The attack may be launched remotely. This vulnerability only affects products that are no longer supported by the maintainer.

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 confidence

OS command injection vulnerability in the NTP service (libdeuteron_modules.so, function handler_update_system_time) of D-Link DIR-825 and DIR-825R routers allows remote attackers to execute arbitrary OS commands via manipulated input to the time update functionality.

MitigationReplace end-of-life DIR-825 devices or implement strict network segmentation/firewall controls to isolate affected devices, as no vendor patch is available for these discontinued products.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS 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
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify device model
    Check the device label or web interface for the exact model number (DIR-825 or DIR-825R). Access the router admin panel via its IP address and look for the status or firmware page to confirm the model.
    Affected if The device is a D-Link DIR-825 or DIR-825R router.
  2. Confirm NTP client service is enabled
    Log into the router web interface and navigate to the time settings or NTP configuration section. Check if the router is configured to synchronize time with an external NTP server.
    Affected if The NTP time synchronization feature is enabled and pointing to an external NTP server.
  3. Check remote management exposure
    In the router web interface, examine the remote management or administration settings. Determine if the web-based management interface is accessible from the WAN (Internet) side.
    Affected if Remote management (HTTP/HTTPS administration from WAN) is enabled, allowing unauthenticated or weakly authenticated remote access to the device.
  4. Verify firmware version
    In the router admin panel, locate the firmware version information (typically under Status, Maintenance, or System section). Compare this version against any available D-Link firmware releases for the DIR-825 series.
    Affected if The installed firmware is an older release that has not been updated to address the command injection vulnerability.
  5. Inspect network exposure of NTP port
    From an external network perspective (or using network scanning tools), check if UDP port 123 (NTP) is open and reachable from the WAN interface of the router.
    Affected if The NTP service port 123 is exposed to untrusted networks, increasing the attack surface for the time update functionality.

The environment is affected if a D-Link DIR-825 or DIR-825R router has the NTP time synchronization feature enabled with remote management accessible, as this allows the command injection flaw in the handler_update_system_time function to be exploited.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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.

dbcve · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Replace end-of-life DIR-825 devices or implement strict network segmentation/firewall controls to isolate affected devices, as no vendor patch is available for these discontinued products.

Recommended fix High confidence
  1. This vulnerability affects D-Link DIR-825 and DIR-825R versions 1.0.5/4.5.1 which are end-of-life products no longer supported by the vendor.
  2. No official patch, firmware update, or upgrade path is available from D-Link for these discontinued products.
  3. The device should be decommissioned and replaced with a currently supported model if NTP functionality is required.
  4. If continued use is unavoidable, network isolation and strict firewall rules should be implemented to limit exposure to remote attacks.
  5. Consider implementing NTP services on separate, hardened infrastructure rather than using the vulnerable device.
Caveat These are end-of-life devices with no vendor support; replacement with a currently supported device is the only reliable remediation.

Generated from the published advisory — verify against the referenced sources before acting.

Have this fixed Scoped from the published advisory
  • Consultation8.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
36.0 hours of engineering $6,400
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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 sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-4627 in production — separate from our analysis above.

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What this is

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