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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 8 May 2026.
Dir 823x FirmwareOperating system · Dlink

CVE-2025-29635

HIGH · 7.2 CVSS v3.1 Published 2025-03-25
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
In the wild High EPSS Public exploit 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 command injection vulnerability in D-Link DIR-823X 240126 and 240802 allows an authorized attacker to execute arbitrary commands on remote devices by sending a POST request to /goform/set_prohibiting via the corresponding function, triggering remote command execution.

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 · moderate confidence

D-Link DIR-823X routers running firmware versions 240126 and 240802 contain a command injection vulnerability in the /goform/set_prohibiting endpoint. An authorized attacker can send a specially crafted POST request to this endpoint, which fails to properly sanitize input, allowing arbitrary command execution on the affected device.

MitigationIf a vendor firmware update is available, apply it immediately. If no patch exists, consider network segmentation to limit exposure or replace the affected device with a supported model, as end-of-life devices may not receive security updates.

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
Dir 823x FirmwareOperating system
Affected:= 240126= 240802

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 the device model
    Access the router web interface or check the device label to confirm it is a D-Link DIR-823X router.
    Affected if The device is a D-Link DIR-823X model.
  2. Check the firmware version
    Log into the router web interface and navigate to Status or System settings to view the firmware version. Alternatively, check the vendor download page or the device itself for the firmware version label.
    Affected if The firmware version is either 240126 or 240802.
  3. Verify management interface accessibility
    Attempt to access the router web interface from the network segment in question. Check if port 80 or 443 (HTTP/HTTPS) is open and reachable on the router IP address.
    Affected if The router management interface (web UI on port 80/443) is accessible from an untrusted network segment.
  4. Check for unauthorized access indicators
    Review router logs for suspicious POST requests to /goform/set_prohibiting endpoints. Use packet capture or intrusion detection logs to identify any anomalous requests to this endpoint.
    Affected if There are any POST requests to /goform/set_prohibiting from untrusted sources or unexpected IP addresses in the logs.

You are affected if you have a D-Link DIR-823X router running firmware version 240126 or 240802 with its management interface exposed to untrusted networks, as the command injection flaw can be exploited by authorized attackers via the /goform/set_prohibiting endpoint.

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

If a vendor firmware update is available, apply it immediately. If no patch exists, consider network segmentation to limit exposure or replace the affected device with a supported model, as end-of-life devices may not receive security updates.

Recommended fix Moderate confidence

Latest DIR-823X firmware available from D-Link support (version > 240802)

  1. 1. Visit D-Link's official support page for the DIR-823X router at support.dlink.com
  2. 2. Navigate to the firmware downloads section for model DIR-823X
  3. 3. Download the latest available firmware version (verify it is newer than 240802)
  4. 4. Access the router's web management interface via browser at the device's local IP address (typically 192.168.0.1)
  5. 5. Navigate to the Administration or System settings section
  6. 6. Select the firmware upgrade option and upload the downloaded firmware file
  7. 7. Wait for the upgrade to complete - do not power off the device during this process
  8. 8. After reboot, verify the new firmware version in the router status page
Caveat Firmware upgrades on older routers may reset configuration to defaults; backup current settings before upgrading if possible

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

Fix this in Dir 823x Firmware Exploited in the wild — priority engagement
  • Consultation2.0 h
  • Implementation1.0 h
  • Testing2.0 h
  • Review / QA1.0 h
6.0 hours of engineering $1,060
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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-2025-29635 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data