Security readout for executives and security teams
Plain-English summary
CVE-2020-20264 is a denial-of-service flaw in MikroTik RouterOS before 6.47 stable. An authenticated remote attacker could crash or disrupt the netwatch process through a divide-by-zero condition. The bundle provides no CVSS score and no evidence of active exploitation.
Executive priority
Treat as a moderate operational resilience issue. It requires authentication and is denial-of-service rather than data theft, but exposed management access on network devices can still create business disruption.
Technical view
The issue affects the RouterOS advanced-tools netwatch process at /ram/pckg/advanced-tools/nova/bin/netwatch. Sources describe authenticated remote denial of service caused by divide by zero. Affected scope is stated as RouterOS stable versions before 6.47; no detailed vendor matrix is included.
Likely exposure
Exposure is most relevant where MikroTik RouterOS stable before 6.47 is deployed and remote authenticated access to management functions exists. Internet-exposed or broadly accessible administration paths increase operational risk.
Exploitation context
The CVE is not listed as KEV in the provided bundle. Public references include a GitHub PoC repository and a Full Disclosure post, but the bundle does not substantiate active exploitation in the wild.
Researcher notes
Evidence is limited: no CVSS, CWE, CPE, or vendor advisory is included in the bundle. Analysis should stay anchored to authenticated DoS in RouterOS stable before 6.47 and avoid broader claims.
Mitigation direction
- Inventory MikroTik RouterOS devices and identify stable versions before 6.47.
- Upgrade affected RouterOS stable systems to 6.47 or later where supported.
- Check MikroTik guidance for branch-specific remediation details.
- Restrict RouterOS administrative access to trusted networks and named administrators.
- Review accounts with RouterOS management privileges.
Validation and detection
- Confirm RouterOS version on each MikroTik device.
- Verify whether the advanced-tools netwatch package is present or used.
- Check management interfaces for unnecessary remote exposure.
- Review logs for unexpected netwatch crashes or device instability.
- Document devices upgraded or accepted as residual risk.
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
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CVE-2020-20264 mapping review
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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_netwatch/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.