CVE-2018-7445: A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages. Remote attackers with access to the...

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

61.02%

99.0th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 29, 2022.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Mikrotik	Routeros	< 6.41.3	—
Mikrotik	Routeros	6.42	Rc11

References

http://seclists.org/fulldisclosure/2018/Mar/38Exploit, Mailing List, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/103427Third Party Advisory, VDB Entry
https://www.coresecurity.com/advisories/mikrotik-routeros-smb-buffer-overflowExploit, Third Party Advisory
https://www.exploit-db.com/exploits/44290/Exploit, Third Party Advisory, VDB Entry
http://seclists.org/fulldisclosure/2018/Mar/38Exploit, Mailing List, Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/103427Third Party Advisory, VDB Entry
https://www.coresecurity.com/advisories/mikrotik-routeros-smb-buffer-overflowExploit, Third Party Advisory
https://www.exploit-db.com/exploits/44290/Exploit, Third Party Advisory, VDB Entry
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-7445US Government Resource

Timeline

Published: Mar 19, 2018
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2018-7445?

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.

How severe is CVE-2018-7445?

CVE-2018-7445 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 61.02% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2018-7445?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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