dbcve.org
RouterosOperating system · Mikrotik

CVE-2019-16160

HIGH · 7.5 CVSS v3.1 Published 2020-10-07
Fix available
A fix is available. Upgrade to 6.45.5 or later.
See remediation →
84/100
Remediation priority · High
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
An integer underflow in the SMB server of MikroTik RouterOS before 6.45.5 allows remote unauthenticated attackers to crash the service.

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

An integer underflow vulnerability exists in the SMB server component of MikroTik RouterOS versions prior to 6.45.5. Remote unauthenticated attackers can exploit this flaw via the network to crash the SMB service, causing a denial of service condition.

MitigationUpgrade MikroTik RouterOS to version 6.45.5 or later to resolve the integer underflow vulnerability in the SMB server. If upgrading is not immediately feasible, consider disabling the SMB service if not required.

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
RouterosOperating system
Affected:< 6.45.5

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
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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 as MikroTik RouterOS
    Access the router via winbox, webfig, or SSH and check the system identity. The router will show as MikroTik device with RouterOS branding.
    Affected if The device is not a MikroTik RouterOS device
  2. Check the RouterOS version
    Run '/system resource print' or '/system identity print' in the router's terminal, or view the version in winbox under System > Resources. Compare the version number to 6.45.5.
    Affected if The installed version is below 6.45.5 (e.g., 6.45.4, 6.44.6, etc.)
  3. Verify SMB service is enabled
    Run '/ip smb print' or check under IP > SMB in winbox/webfig to see if SMB is enabled.
    Affected if SMB service is enabled and running on the router
  4. Check SMB network exposure
    Run '/ip smb print' to review the 'interface' binding. By default SMB binds to all interfaces. Check under IP > SMB > Interfaces in winbox to see which interfaces SMB is listening on.
    Affected if SMB is bound to a network-facing interface (such as 'all', 'bridge', or a WAN interface) accessible to remote attackers

A MikroTik RouterOS device is affected if it runs a version prior to 6.45.5 AND has the SMB service enabled and exposed to the network.

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
Upgrade available Upgrade to 6.45.5 or later
Fixed in 6.45.5
Interim mitigation

Upgrade MikroTik RouterOS to version 6.45.5 or later to resolve the integer underflow vulnerability in the SMB server. If upgrading is not immediately feasible, consider disabling the SMB service if not required.

Fix this in Routeros Scoped from the published advisory
  • Consultation2.0 h
  • Implementation2.0 h
  • Testing2.0 h
6.0 hours of engineering $1,060
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,696.

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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-2019-16160 in production — separate from our analysis above.

No notes yet

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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