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    CVE-2026-84411

    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.

    Published:Oct 2, 2026
    Last Modified:Oct 3, 2026
    EPS:Oct 2, 2026
    EPSS Score:0.00945
    CVSS Score:9.8

    Affected Products

    Vendor
    Mikrotik
    Product
    Routeros

    Exploits

    https://github.com/Apiratchai/CVE-2026-84411-reproductionhttps://github.com/maxprog-svg/CVE-2026-84411https://github.com/MikroTikDojo/CVE-2026-84411

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-56719 (CVSS 6.3) — MikroTik RouterOS before 7.24 contains an out-of-bounds read vulnerability in the userspace SMB daemon that al…
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    CVE-2026-89020 (CVSS 5.3) — MikroTik RouterOS before 7.23.4 (long-term) and 7.24.2 (stable) contains a stack-based buffer overflow vulnera…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High