What’s Vulnerable › Vulnerabilities

CVE-2017-20149

• Severity: critical (CVSS 9.8 v3.1)
• 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: 2022-10-15 · updated 2026-06-17
• Weakness: CWE-787

Description

The Mikrotik RouterOS web server allows memory corruption in releases before Stable 6.38.5 and Long-term 6.37.5, aka Chimay-Red. A remote and unauthenticated user can trigger the vulnerability by sending a crafted HTTP request. An attacker can use this vulnerability to execute arbitrary code on the affected system, as exploited in the wild in mid-2017 and later.

Affected products

• MikroTik RouterOS: before 6.37.5; from 6.38 before 6.38.5 — fixed in 6.37.5, 6.38.5

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.37.5, 6.38.5. Check the vendor advisory for mitigations.

References

• https://github.com/BigNerd95/Chimay-Red
• https://www.bleepingcomputer.com/news/security/hajime-botnet-makes-a-comeback-with-massive-scan-for-mikrotik-routers/
• https://github.com/BigNerd95/Chimay-Red
• https://www.bleepingcomputer.com/news/security/hajime-botnet-makes-a-comeback-with-massive-scan-for-mikrotik-routers/

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