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CVE-2018-7445

MikroTik RouterOS Stack-Based Buffer Overflow

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 60.8%
  1. Published19 Mar 2018
  2. Added to CISA KEV8 Sept 2022
  3. Remediation due29 Sept 2022
Actively exploited (CISA KEV)

In MikroTik RouterOS, a stack-based buffer overflow occurs when processing NetBIOS session request messages. Remote attackers with access to the service can exploit this vulnerability and gain code execution on the system.

Added to KEV: 8 Sept 2022Federal remediation due: 29 Sept 2022

Description

A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages. Remote attackers with access to the service can exploit this vulnerability and gain code execution on the system. The overflow occurs before authentication takes place, so it is possible for an unauthenticated remote attacker to exploit it. All architectures and all devices running RouterOS before versions 6.41.3/6.42rc27 are vulnerable.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Mikrotik Routeros< 6.41.3 · 6.42

Remediation

Fixed in
Mikrotik Routeros≥ 6.41.3

References

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Frequently asked

Is CVE-2018-7445 being actively exploited?

Yes. CVE-2018-7445 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 8 Sept 2022.

How severe is CVE-2018-7445?

CVE-2018-7445 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 60.8% probability of exploitation.

Which products are affected by CVE-2018-7445?

Affected products include Mikrotik Routeros.

How do I fix CVE-2018-7445?

Upgrade affected software to a fixed version, for example Mikrotik Routeros 6.41.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-7445 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.