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PatchSiren cyber security CVE debrief

CVE-2024-27686 Mikrotik CVE debrief

A denial-of-service vulnerability exists in Mikrotik RouterOS (x86) versions 6.40.5 through 6.49.10. An attacker can cause a device crash by sending crafted packet data to the SMB service on TCP port 445. This issue affects network availability and requires verification of SMB service exposure and assessment of potential impact on network operations. Defenders should prioritize verifying exposure and assessing impact. The vulnerability has a CVSS score of 7.5 and is classified as HIGH severity.

Vendor
Mikrotik
Product
RouterOS (x86)
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-08
Original CVE updated
2026-10-28
Advisory published
2026-05-08
Advisory updated
2026-10-28

Who should care

Defenders responsible for Mikrotik RouterOS devices, network operations teams, and security teams should be aware of this vulnerability and assess potential exposure and impact.

Why it matters

A denial-of-service vulnerability exists in Mikrotik RouterOS (x86) versions 6.40.5 through 6.49.10. Defenders should prioritize verifying exposure of SMB services and assessing potential impact on network operations.

  • Device crashes may impact network availability
  • Verification of SMB service exposure is necessary
  • Potential impact on network operations requires assessment

Technical summary

The vulnerability exists in Mikrotik RouterOS (x86) versions 6.40.5 through 6.49.10. An attacker can cause a device crash by sending crafted packet data to the SMB service on TCP port 445. This issue has a CVSS score of 7.5 and is classified as HIGH severity. Defenders should prioritize verifying exposure of SMB services and assessing potential impact on network operations.

Defensive priority

Defenders should prioritize verifying exposure of SMB services and assessing potential impact on network operations.

Recommended defensive actions

  • Verify exposure of SMB services on Mikrotik RouterOS devices
  • Assess potential impact on network operations
  • Monitor for crafted packet data on TCP port 445

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, additional information on affected versions and remediation is limited. The vulnerability has been publicly disclosed and defenders should verify exposure of SMB services and assess potential impact on network operations. The CVE record was published on 2026-05-08T06:16:09.003Z and has not been modified since then. There are limited details on affected versions and remediation available.

Sources and references

Verified primary and authoritative sources

  • CVE-2024-27686 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2024-27686

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2024-27686 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2024-27686

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.