CVE-2026-20321 Cisco Application Policy Infrastructure Controller API Command Injection Vulnerability
Authenticated attackers with admin credentials can execute arbitrary root commands on Cisco APIC via the web management API due to insufficient input validation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20321?
CVE-2026-20321 is a medium-severity command injection vulnerability in Cisco Application Policy Infrastructure Controller (APIC), published on 7 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-544
Which versions are affected by CVE-2026-20321?
How do I fix CVE-2026-20321?
No fix has been published for CVE-2026-20321 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-20321 being exploited?
There is no known exploitation of CVE-2026-20321 in the wild and no public exploit code.
Sources
Also known as GHSA-r72r-fhv8-5qgq.