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Vulnerability record · CVE-2018-1156 · published 23 August 2018

CVE-2018-1156: Mikrotik routeros out-of-bounds write vulnerability

Mikrotik · Routeros

Mikrotik RouterOS before 6.42.7 and 6.40.9 is vulnerable to stack buffer overflow through the license upgrade interface. This vulnerability could theoretically allow a remote authenticated attacker execute arbitrary code on the system.

8.8 CVSS 3.0 High EPSS 7.4% · top 5.8% CWE-787 · Out-of-bounds write
8.8CVSS 3.0 base score, v2 9.0
7.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Mikrotik RouterOS before 6.42.7 and 6.40.9 is vulnerable to stack buffer overflow through the license upgrade interface. This vulnerability could theoretically allow a remote authenticated attacker execute arbitrary code on the system.

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://mikrotik.com/download/changelogs Vendor Advisory
https://mikrotik.com/download/changelogs/bugfix-release-tree Vendor Advisory
https://www.tenable.com/security/research/tra-2018-21 ExploitThird Party Advisory
https://mikrotik.com/download/changelogs Vendor Advisory
https://mikrotik.com/download/changelogs/bugfix-release-tree Vendor Advisory
https://www.tenable.com/security/research/tra-2018-21 ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-1156), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.