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Classic Buffer OverflowWeakness · CWE-120

CVE-2025-25529

MEDIUM · 5.1 CVSS v3.1 Published 2025-02-11
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
56/100
Remediation priority · Elevated
No privileges 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
Buffer overflow vulnerability in Digital China DCBC Gateway 200-2.1.1 due to the lack of length verification, which is related to the configuration of static NAT rules. Attackers who successfully exploit this vulnerability can cause the remote target device to crash or execute arbitrary commands.

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

A buffer overflow vulnerability exists in Digital China DCBC Gateway 200 firmware version 2.1.1 due to insufficient length validation when processing static NAT rule configurations. An attacker can send specially crafted NAT rule configuration data to trigger the overflow, potentially causing device crash or enabling arbitrary command execution on the affected gateway.

MitigationContact Digital China for the applicable firmware patch to address the buffer overflow in NAT rule processing. If no patch is available, consider network segmentation to limit exposure of the gateway to untrusted networks.

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
Local
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

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. Determine the firmware version
    Access the device admin interface or use the command line interface to retrieve the installed firmware version of the Digital China DCBC Gateway 200
    Affected if The installed firmware version is 2.1.1
  2. Confirm NAT functionality is enabled
    Check the device network configuration settings to verify whether Network Address Translation (NAT) is enabled on the gateway
    Affected if NAT is enabled and the firmware version is 2.1.1
  3. Inspect static NAT rule configuration
    Navigate to the NAT configuration section in the device management interface and review any configured static NAT rules for anomalies or unexpected entries
    Affected if Static NAT rules are present and the firmware version is 2.1.1

The device is affected if it is running firmware version 2.1.1 and has static NAT rules configured, since the buffer overflow occurs during processing of these NAT rule configurations.

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.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Contact Digital China for the applicable firmware patch to address the buffer overflow in NAT rule processing. If no patch is available, consider network segmentation to limit exposure of the gateway to untrusted networks.

Have this fixed Scoped from the published advisory
  • Consultation2.0 h
  • Implementation3.0 h
  • Testing4.0 h
  • Review / QA2.0 h
11.0 hours of engineering $1,900
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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-2025-25529 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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