What is CVE-2021-27221?

CVE-2021-27221 is a high-severity vulnerability in Mikrotik Routeros. CVSS score: 8.1/10. Published 2021-03-19.

How severe is CVE-2021-27221?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2021-27221 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Mikrotik Routeros

CVE-2021-27221

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

EPSS: 0.045 (90.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

Affected products

Mikrotik Routeros — versions 6.47.9
N/a — versions n/a

Public proof-of-concept exploits

zhanpengliu-tencent/medium-cve

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-27221?: CVE-2021-27221 is a high-severity vulnerability in Mikrotik Routeros. CVSS score: 8.1/10. Published 2021-03-19.
How severe is CVE-2021-27221?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2021-27221 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.