Vulnerability report

Exploited in the wild No CVE assigned yet High confidence Not in CISA KEV

VULN-2026-0004

MikroTik RouterOS

MicroTik / RouterOS

View live feed Monitor via API Watch VULN-2026-0004
Severity
CVSS 8.1 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
—
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

VULN-2026-0004 is an unauthenticated MikroTik RouterOS. A security vulnerability in MikroTik RouterOS may allow attackers to compromise affected devices under certain configurations. MikroTik has not yet disclosed...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

MicroTik / RouterOS.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

MikroTik RouterOS

A security vulnerability in MikroTik RouterOS may allow attackers to compromise affected devices under certain configurations. MikroTik has not yet disclosed full technical details, but has advised administrators to restrict WinBox, WebFig, and SSH management interfaces from untrusted networks.

After upgrading, RouterOS checks for indicators of compromise and may mark affected devices as "Flagged". Fixes are available in RouterOS 7.25 beta 3, 7.24.2, 7.23.4, 6.49.21, and later releases.

Published
05 Sep 2026
Exploitation Reported
04 Sep 2026
Attack vector
Remote
Complexity
High
Privileges
None
User interaction
None

Tags

edge

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

MicroTik

Recorded 04 Sep 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
MicroTik First 2026-09-04 08:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.1 High
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

—

Timeline

From disclosure to observed exploitation

  1. 20:19 UTC

    VULN published

    Vulnerability disclosed publicly

  2. 08:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/VULN-2026-0004

Free JSON includes basic KEV fields 
{
  "cve_id": "VULN-2026-0004",
  "confidence": "High",
  "cvss_score": 8.1,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}