What’s Vulnerable › Vulnerabilities

CVE-2018-1158

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-08-23 · updated 2026-06-17
• Weakness: CWE-674

Description

Mikrotik RouterOS before 6.42.7 and 6.40.9 is vulnerable to a stack exhaustion vulnerability. An authenticated remote attacker can crash the HTTP server via recursive parsing of JSON.

Affected products

• MikroTik RouterOS: before 6.40.9; before 6.42.7 — fixed in 6.40.9, 6.42.7

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.40.9, 6.42.7. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2019/Jul/20
• https://mikrotik.com/download/changelogs
• https://mikrotik.com/download/changelogs/bugfix-release-tree
• https://www.tenable.com/security/research/tra-2018-21
• http://seclists.org/fulldisclosure/2019/Jul/20
• https://mikrotik.com/download/changelogs
• https://mikrotik.com/download/changelogs/bugfix-release-tree
• https://www.tenable.com/security/research/tra-2018-21

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