CVE-2020-20021

HIGH

MikroTik RouterOS < 6.46.3 - Denial of Service via SSH Daemon Misconfiguration

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-20021. PoCs published by FarazPajohan.

AI-analyzed exploit summary This exploit demonstrates an uncontrolled resource consumption vulnerability in MikroTik SSH daemon (v6.44.3 and earlier) by establishing multiple connections and writing null bytes, leading to a denial of service (DoS) via SIGPIPE signal and potential system reboot.

Description

An issue discovered in MikroTik Router v6.46.3 and earlier allows attacker to cause denial of service via misconfiguration in the SSH daemon.

Exploits (1)

exploitdb WORKING POC
by FarazPajohan · textdoshardware
https://www.exploit-db.com/exploits/48228

This exploit demonstrates an uncontrolled resource consumption vulnerability in MikroTik SSH daemon (v6.44.3 and earlier) by establishing multiple connections and writing null bytes, leading to a denial of service (DoS) via SIGPIPE signal and potential system reboot.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Moderate
Reliability
Reliable
Target: MikroTik RouterOS SSH Daemon through v6.44.3
No auth needed
Prerequisites: network access to the target SSH port · ability to establish multiple concurrent connections
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Not Applicable
http://router.com
Exploit, Third Party Advisory, VDB Entry
https://www.exploit-db.com/exploits/48228

Scores

CVSS v3 7.5
EPSS 0.0134
EPSS Percentile 67.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (1)
mikrotik/routeros < 6.46.3
Published Jul 12, 2023
Tracked Since Feb 18, 2026