CVE-2026-84411

CVE Enrichment

CVSS: 9.3 CRITICAL
EPSS: 0.95%
EPSS Percentile: 59.99%
CISA KEV: Not listed

Description

The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling that is reachable before authentication. This can be leveraged by an unauthenticated network attacker to achieve arbitrary code execution as root, or to cause a denial of service, using a single crafted request.

Technical Details

CVSS Version: 4.0
CNA / NVD Source: ics-cert@hq.dhs.gov
Published: 03-Oct-2026 06:16
Last Modified: 06-Oct-2026 22:15
EPSS Date: 2026-10-11
CWE: CWE-191

CVSS Vector


            CVSS:4.0                            AV:N /
                            AC:L /
                            AT:N /
                            PR:N /
                            UI:N /
                            VC:H /
                            VI:H /
                            VA:H /
                            SC:N /
                            SI:N /
                            SA:N /
                            E:X /
                            CR:X /
                            IR:X /
                            AR:X /
                            MAV:X /
                            MAC:X /
                            MAT:X /
                            MPR:X /
                            MUI:X /
                            MVC:X /
                            MVI:X /
                            MVA:X /
                            MSC:X /
                            MSI:X /
                            MSA:X /
                            S:X /
                            AU:X /
                            R:X /
                            V:X /
                            RE:X /
                            U:X

References

Last enrichment sync: 12-Oct-2026 06:06
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

CVE-2026-16796 (Amazon Bedrock AgentCore Python SDK), CVE-2026-76504 (Cisco Catalyst SD-WAN Manager), CVE-2026-84411 (MikroTik RouterOS), CVE-2026-19743, CVE-2026-92368, CVE-2026-92369, CVE-2026-92370, CVE-2026-92371, Weekly Security Recap: Exploited Citrix NetScaler Flaw and Dozens of Vulnerabilities

CVE (135)

Vendors (1)

Products (2)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.