Vulnerability · Published Oct 7, 2026 · Assigned by cisco
CVE-2026-20321Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability
Medium 6.5
In plain English
A medium-severity security flaw in Cisco Application Policy Infrastructure Controller (APIC) from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Cisco Application Policy Infrastructure Controller (APIC) | 5.3(1d)5.3(2a)5.3(2b)5.3(2c)5.3(2d)5.3(2e)5.3(2f)6.1(5e) |
Weakness: CWE-544 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N