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IoxApplication · Cisco

CVE-2017-3853

CRITICAL · 9.8 CVSS v3.0 Published 2017-03-22
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
Remotely reachable 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
A vulnerability in the Data-in-Motion (DMo) process installed with the Cisco IOx application environment could allow an unauthenticated, remote attacker to cause a stack overflow that could allow remote code execution with root privileges in the virtual instance running on an affected device. The vulnerability is due to insufficient bounds checking in the DMo process. An attacker could exploit this vulnerability by sending crafted packets that are forwarded to the DMo process for evaluation. The impacts of a successful exploit are limited to the scope of the virtual instance and do not impact the router that is hosting Cisco IOx. This vulnerability affects the following Cisco 800 Series Industrial Integrated Services Routers: Cisco IR809 and Cisco IR829. Cisco IOx Releases 1.0.0.0 and 1.1.0.0 are vulnerable. Cisco Bug IDs: CSCuy52330.

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

A stack overflow vulnerability in the Data-in-Motion (DMo) process of Cisco IOx application environment allows unauthenticated remote attackers to execute arbitrary code with root privileges by sending specially crafted packets to affected devices. The vulnerability stems from insufficient bounds checking in the DMo process. The attack is scoped to the virtual instance only and does not compromise the host router. Affected devices are Cisco IR809 and IR829 Industrial Integrated Services Routers running Cisco IOx Releases 1.0.0.0 and 1.1.0.0.

MitigationUpgrade Cisco IOx to a patched release that addresses the vulnerability. If upgrading is not immediately feasible, consider network segmentation to limit exposure of affected devices to untrusted networks.

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
IoxApplication
Affected:= 1.1\(0\)= 1.1.0

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

CVSS:3.0/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 checks

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

  1. Identify the device model
    Run 'show version' or check the device hardware label to confirm the model is Cisco IR809 or IR829 Industrial Integrated Services Router
    Affected if The device is NOT an IR809 or IR829 router (the vulnerability only affects these models)
  2. Check the Cisco IOx version
    Run 'iox client version' or 'show iox' command to retrieve the installed IOx version
    Affected if The IOx version is 1.0.0.0 or 1.1.0.0 (exact versions known to be vulnerable)
  3. Verify the DMo process is running
    Run 'show process cpu' or check running processes to confirm the DMo (Data-in-Motion) process is active on the device
    Affected if The DMo process is running and exposed to network traffic
  4. Assess network exposure of the device
    Review the device network configuration and firewall rules to determine if the DMo service port is accessible from untrusted networks
    Affected if The device DMo service is reachable from untrusted or external networks without network segmentation

A user is affected if they have a Cisco IR809 or IR829 router running IOx version 1.0.0.0 or 1.1.0.0 with the DMo process exposed to accessible network interfaces.

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

Upgrade Cisco IOx to a patched release that addresses the vulnerability. If upgrading is not immediately feasible, consider network segmentation to limit exposure of affected devices to untrusted networks.

Recommended fix Moderate confidence

Cisco IOx Release 1.2.0.0 or later

  1. 1. Identify the current Cisco IOx version running on the affected device (IR809 or IR829) using the 'show iox' command or via the IOx management interface.
  2. 2. Download the fixed Cisco IOx release from the Cisco Software Download Center. The fixed version is Cisco IOx Release 1.2.0.0 or later.
  3. 3. Upgrade the Cisco IOx application environment on the affected device by accessing the device's management interface and uploading the new IOx package.
  4. 4. After upgrading, verify the IOx version has been updated to 1.2.0.0 or later using 'show iox' or by checking the IOx management interface.
  5. 5. Confirm the upgrade was successful and the device is functioning normally with the new IOx version.
Caveat Review Cisco release notes for any configuration or compatibility changes between versions 1.0/1.1 and 1.2+ before upgrading

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

Fix this in Iox Scoped from the published advisory
  • Consultation4.0 h
  • Implementation3.0 h
  • Testing2.0 h
  • Review / QA1.0 h
10.0 hours of engineering $1,820
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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-2017-3853 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