Security readout for executives and security teams
Plain-English summary
This issue can let an authenticated remote user crash part of MikroTik RouterOS, causing denial of service. The available record names RouterOS before stable version 6.47 and the dot1x process. The sources do not provide CVSS, broad product mapping, or evidence of active exploitation.
Executive priority
Prioritize remediation for internet-facing or operationally critical MikroTik routers. The known impact is denial of service, but router outages can disrupt business connectivity and recovery operations.
Technical view
CVE-2020-20266 is described as memory corruption in RouterOS /nova/bin/dot1x before 6.47 stable, resulting in a NULL pointer dereference denial of service by an authenticated remote attacker. Public references include disclosure material and a PoC repository, but the bundle does not establish real-world exploitation.
Likely exposure
Exposure is most likely on MikroTik RouterOS devices running stable releases before 6.47, especially where authenticated remote access to the affected dot1x-related surface is possible.
Exploitation context
The CVE is not in KEV, and the provided sources do not claim active exploitation. Public technical references exist, so defenders should treat the issue as publicly documented rather than theoretical.
Researcher notes
Evidence is limited to the CVE description and public disclosure references. The affected product data in the bundle is incomplete, so avoid broad claims beyond MikroTik RouterOS before 6.47 stable and the dot1x process.
Mitigation direction
- Upgrade affected MikroTik RouterOS stable installations to 6.47 or later where applicable.
- Check current MikroTik guidance for supported release and configuration recommendations.
- Restrict authenticated management access to trusted administrators and networks.
- Review whether dot1x-related functionality is needed on exposed devices.
Validation and detection
- Inventory MikroTik RouterOS versions and flag stable releases before 6.47.
- Confirm whether affected devices use or expose dot1x-related functionality.
- Review access controls for authenticated remote users on affected routers.
- Check monitoring and logs for unexplained dot1x process crashes or service disruption.
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.
CVE-2020-20266 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/cq674350529/pocs_slides/blob/master/pocs/MikroTik/vul_dot1x/README.mdCVE reference · x_refsource_MISC
- https://seclists.org/fulldisclosure/2021/May/11CVE reference · x_refsource_MISC
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.