Vulnerability in Cisco Secure Firewall Management Center (Fmc)
CVE-2026-20018
A vulnerability in the sftunnel functionality of Cisco Secure Firewall Management Center (FMC) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker with administrative privileges to write arbitrary files as root on the underlying operating system. This vulnerability is due to insufficient validation of the directory path during file synchronization. An attacker could exploit this vulnerability by crafting a directory path outside of the expected file location. A successful exploit could allow the attacker to create or replace any file on the underlying operating system.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Cisco Secure Firewall Management Center (Fmc) — versions 7.0.0, 7.0.0.1, 7.0.1
- Cisco Secure Firewall Threat Defense (Ftd) Software — versions 7.0.0, 7.0.0.1, 7.0.1
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20018?
- CVE-2026-20018 is a medium-severity vulnerability in Cisco Secure Firewall Management Center (Fmc), classified under CWE-27. CVSS score: 5.9/10. Published 2026-03-04.
- How severe is CVE-2026-20018?
- Medium severity. CVSS v3 base score is 5.9 out of 10.