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CVE-2020-11881 is an array index error vulnerability in MikroTik RouterOS versions 6.41.3 through 6.46.5 and 7.x through 7.0 Beta5. The flaw resides in the SMB server implementation, where improper handling of array indices in response to specially crafted setup-request packets allows an unauthenticated remote attacker to trigger a crash of the SMB service. This issue is referenced internally as SUP-12964.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository provides a proof-of-concept exploit for CVE-2020-11881, a remote, unauthenticated denial of service vulnerability in the SMB service of MikroTik RouterOS. The main exploit script, cve-2020-11881.py, is written in Python and sends a sequence of specially crafted SMB packets to the target device's SMB service (default port 445). If the target is vulnerable, the SMB service will crash, resulting in a denial of service. The repository also includes a bash script, setupMikroTikEnvironment.sh, which automates the setup of a RouterOS virtual machine for testing purposes by downloading the appropriate VM image and configuring it in VirtualBox. The README provides detailed instructions for setting up the environment, enabling SMB on RouterOS, running the exploit, and verifying the result. The exploit targets multiple versions of MikroTik RouterOS, primarily those released before September 2020. No weaponized or post-exploitation payload is included; the exploit is focused solely on causing a service crash.
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