Vulnerability in Cisco Application Policy Infrastructure Controller (Apic)
CVE-2026-20321
A vulnerability in the web-based management API for Cisco Application Policy Infrastructure Controller (APIC) could allow an authenticated, remote attacker to execute arbitrary commands as the root user. To exploit this vulnerability, the attacker must have valid administrative credentials. This vulnerability is due to insufficient input validation of user-controlled command arguments. An attacker could exploit this vulnerability by authenticating using the API and sending crafted input. A successful exploit could allow the attacker to execute arbitrary commands on the underlying operating system of an affected device with root-level privileges.
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Application Policy Infrastructure Controller (Apic) — versions 5.3(1d), 5.3(2a), 5.3(2b)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20321?
- CVE-2026-20321 is a medium-severity vulnerability in Cisco Application Policy Infrastructure Controller (Apic), classified under CWE-544. CVSS score: 6.5/10. Published 2026-10-07.
- How severe is CVE-2026-20321?
- Medium severity. CVSS v3 base score is 6.5 out of 10.