Description
A weakness has been identified in MikroTik RouterOS up to 6.40.5/6.44/7.20.8. Impacted is the function same_check of the file ipt_SAME.ko. Executing a manipulation can lead to integer overflow. The attack may be launched remotely. Upgrading to version 7.21.5 and 7.23.1 is recommended to address this issue. You should upgrade the affected component.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| MikroTik | RouterOS | 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 6.10, 6.11, 6.12, 6.13, 6.14, 6.15, 6.16, 6.17, 6.18, 6.19, 6.20, 6.21, 6.22, 6.23, 6.24, 6.25, 6.26, 6.27, 6.28, 6.29, 6.30, 6.31, 6.32, 6.33, 6.34, 6.35, 6.36, 6.37, 6.38, 6.39, 6.40, 6.40.0, 6.40.1, 6.40.2, 6.40.3, 6.40.4, 6.40.5, 6.41, 6.42, 6.4… | 7.21.5 |
Advisories 1
- WID-SEC-2026-4042 MikroTik RouterOS: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Oct 19, 2026
References
- VDB-422285 | MikroTik RouterOS ipt_SAME.ko same_check integer overflow vdb-entry technical-description
- VDB-422285 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-112158 | CVE Analysis and Report third-party-advisory
- Submit #956852 | MikroTik RouterOS <= 7.20.x long-term channel (tested: 6.40.5, 6.44, 7.20.8); v6 line affected Integer Overflow third-party-advisory
- https://github.com/MeetFireAgain/cve/mikrotik/routeros-ipt-same-integer-overflow-brick.md broken-link