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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.040 (90.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 90.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.045 · newest: 0.040 · change: -0.004
Affected products
- Mikrotik Routeros — versions 6.47.9
Public proof-of-concept exploits
References
- onovy.medium.com/routeros-user-with-just-ftp-policy-can-write-to-filesystem-cve… (Exploit, Third Party Advisory)
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.