CVE-2017-20149

Name: CVE-2017-20149
Creator: NVD / NIST
Published: 2022-10-15T02:15:08.497+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.55%

Last modified Jun 17, 2026

CVE-2017-20149 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 2.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.55%

83.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mikrotik	Routeros	< 6.37.5
Mikrotik	Routeros	>= 6.38, < 6.38.5

References

https://github.com/BigNerd95/Chimay-RedExploit, Third Party Advisory
https://www.bleepingcomputer.com/news/security/hajime-botnet-makes-a-comeback-with-massive-scan-for-mikrotik-routers/Exploit, Third Party Advisory
https://github.com/BigNerd95/Chimay-RedExploit, Third Party Advisory
https://www.bleepingcomputer.com/news/security/hajime-botnet-makes-a-comeback-with-massive-scan-for-mikrotik-routers/Exploit, Third Party Advisory

Timeline

Published: Oct 15, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-20149?

How severe is CVE-2017-20149?

CVE-2017-20149 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.55% probability of exploitation in the next 30 days.

How do I fix CVE-2017-20149?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-20149?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST