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    CVE-2019-3924

    MikroTik RouterOS before 6.43.12 (stable) and 6.42.12 (long-term) is vulnerable to an intermediary vulnerability. The software will execute user defined network requests to both WAN and LAN clients. A remote unauthenticated attacker can use this vulnerability to bypass the router's firewall or for general network scanning activities.

    Published:Feb 20, 2019
    Last Modified:Aug 15, 2025
    EPS:Feb 20, 2019
    EPSS Score:0.12217
    CVSS Score:7.5

    Affected Products

    Vendor
    Mikrotik
    Product
    Routeros

    Exploits

    https://www.exploit-db.com/exploits/46444/https://www.tenable.com/security/research/tra-2019-07https://www.exploit-db.com/exploits/46444/https://www.tenable.com/security/research/tra-2019-07https://www.exploit-db.com/exploits/46444

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-219 XML Routing Detour Attacks
    CAPEC-465 Transparent Proxy Abuse

    Related CVEs

    CVE-2026-86060 (CVSS 9.2) — RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohib…
    CVE-2026-67281 (CVSS 8.7) — RouterOS WebFig contains an unauthenticated file-read vulnerability in the /jsproxy path where a newly allocat…
    CVE-2026-67279 (CVSS 6.9) — RouterOS SSH enters the connection protocol after a client-requested rekey even though user authentication was…
    CVE-2026-67278 (CVSS 6.3) — MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 validation. Because its trust stor…
    CVE-2026-67277 (CVSS 8.8) — RouterOS accepts a "related" btest connection before the corresponding primary session has completed authentic…
    CVE-2026-67276 (CVSS 9.2) — RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an author…
    CVE-2026-14227 (CVSS 6.9) — An API session‑management flaw in products with the MikroTik RouterOS API enabled are vulnerable to a Insuffic…
    CVE-2026-16347 (CVSS 8.7) — MikroTik RouterOS contains a weakness in its API authentication handling that lacks effective safeguards again…
    CVE-2026-39042 (CVSS 7.5) — An issue in MikroTIk (SIA Mikrotikls, Latvia) RouterOS 7.21.x before v.7.21.4 and 7.22.x before v.7.22.2 allow…
    CVE-2024-27686 (CVSS 7.5) — Mikrotik RouterOS (x86) 6.40.5 through 6.49.10 (fixed in 7) allows a remote attacker to cause a denial of serv…

    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