THREATPORT/VULNERABILITY/CVE-2021-27221
HIGH SEVERITY

CVE-2021-27221

Routeros vulnerability

CVSS
8.1
EPSS
4.5%
EPSS pct
90th
Exploited
No known
MikroTik RouterOS 6.47.9 allows remote authenticated ftp users to create or overwrite arbitrary .rsc files via the /export command. NOTE: the vendor's position is that this is intended behavior because of how user policies work
Affected vendor
Mikrotik
Affected product
Routeros
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Published
2021-03-19

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring low privileges, no user interaction. Successful exploitation leads to high impact to integrity, high impact to availability.

Its EPSS score of 4.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 90% of all scored CVEs.

Check your external exposure to CVE-2021-27221

  • Confirm whether Mikrotik Routeros is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-27221.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-27221

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-27221 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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