CVE-2020-22845Public exploitNetwork attack vector

Unauthenticated device reboot via unchecked FTP request

Published Feb 28, 2022 · Updated Aug 4, 2024

Buffer overflow in the FTP service of MikroTik RouterOS 6.47 allows remote attackers to reboot devices with crafted FTP requests. The nova/ftpd process fails to check the length of the first request, so an oversized payload exhausts memory and reboots the system. No authentication or syntactically valid FTP command is required; network access to the FTP control service is sufficient, and the demonstrated consequence is a device reboot.

CVSS severity7.5
High
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the FTP service of MikroTik RouterOS 6.47 allows remote attackers to reboot devices with crafted FTP requests. The nova/ftpd process fails to check the length of the first request, so an oversized payload exhausts memory and reboots the system. No authentication or syntactically valid FTP command is required; network access to the FTP control service is sufficient, and the demonstrated consequence is a device reboot.

The record

CVE
CVE-2020-22845
Published
Feb 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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