CVE-2021-27221
** DISPUTED ** MikroTik RouterOS 6.47.9 allows remote authenticated ftp users to create or...
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
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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
- Record
CVE-2021-27221- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - CVSS 2.0
- 8.5 High
AV:N/AC:L/Au:S/C:N/I:C/A:C - Updated
- 2026-11-02
CVE List No score
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
- Record
CVE-2021-27221- Updated
- 2026-11-02
EUVDEUVD-2021-13986 No score
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
- Record
EUVD-2021-13986- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xf77-xqpr-2gh9
** DISPUTED ** MikroTik RouterOS 6.47.9 allows remote authenticated ftp users to create or...
** DISPUTED ** 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.
- Record
GHSA-xf77-xqpr-2gh9- CVSS 3.1
- 8.1 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - Weakness
- CWE-77
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27221 is a high vulnerability (CVSS 8.1) in Mikrotik Routeros, published March 19, 2021. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 4.04%, the 90th percentile.