CVE-2017-20149: mikrotik routeros Out-of-bounds Write
Vulnerability summary
CVE-2017-20149 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in mikrotik routeros. EPSS estimates a 2.47% chance of exploitation in the next 30 days, higher than 84.3% of scored vulnerabilities. 2 public exploits are recorded.
Timeline
- 15-10-2022PublishedVulnerability first disclosed.
- 14-05-2025Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 2 sources · 1 version- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
2.47%
Chance of exploitation in the next 30 days
Percentile
84%
Versus all other CVEs
30-day change
+0.47 pp
From 2.00% on 22-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundChimay Red
Maturity: poc
Exploit Reference (bleepingcomputer.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Mikrotik1 product
- routeros< 6.37.5 | ≥ 6.38, < 6.38.5
1 vendor · 1 product