Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated internet user take control of vulnerable MikroTik RouterOS devices through the web server. The business risk is loss of router integrity, traffic interception, outages, and use of network edge devices in botnets. The provided sources describe historical in-the-wild exploitation, but do not prove current active exploitation.
Executive priority
Treat this as urgent for any internet-exposed MikroTik estate. The vulnerability is old but severe, historically exploited, unauthenticated, and affects network-edge control. Prioritize discovery, web-interface exposure reduction, and firmware upgrade verification.
Technical view
CVE-2017-20149 is a RouterOS web server memory corruption issue, also called Chimay-Red. Releases before Stable 6.38.5 and Long-term 6.37.5 are described as vulnerable. It is network reachable, requires no credentials or user interaction, and can allow arbitrary code execution on the affected router.
Likely exposure
Exposure is most likely where MikroTik RouterOS web management is internet reachable and running pre-6.38.5 Stable or pre-6.37.5 Long-term firmware. The bundle does not provide complete CPE data, so asset owners must validate by inventory, firmware channel, version, and management-service exposure.
Exploitation context
The CVE description states exploitation occurred in the wild in mid-2017 and later. A public Chimay-Red repository and reporting about botnet scanning for MikroTik routers increase practical concern. KEV is false in the bundle, so current active exploitation is not established here.
Researcher notes
The source bundle identifies the vulnerability class, affected version thresholds, CVSS 9.8, CWE-787, and historical exploitation. It does not provide authoritative CPEs, a complete vendor advisory, or proof of current active exploitation. Avoid assuming products beyond MikroTik RouterOS web server releases named here.
Mitigation direction
- Upgrade affected RouterOS devices to 6.38.5 Stable, 6.37.5 Long-term, or later vendor-supported firmware.
- Remove internet exposure from RouterOS web management interfaces.
- Restrict management access to trusted administrative networks or VPN paths only.
- Review MikroTik guidance for any additional hardening or compromise recovery steps.
- Prioritize replacement or isolation for devices that cannot be safely updated.
Validation and detection
- Inventory MikroTik RouterOS devices and record firmware channel and version.
- Confirm whether the web management service is enabled and reachable from untrusted networks.
- Check edge firewall rules for unintended HTTP management exposure.
- Review device and network telemetry for suspicious management-plane activity.
- Validate upgraded devices report fixed or later RouterOS versions.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2017-20149 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.