CVE-2021-1581: Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulnerabilities

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-08-25 · updated 2026-06-17
Weakness: CWE-284

Description

Multiple vulnerabilities in the web UI and API endpoints of Cisco Application Policy Infrastructure Controller (APIC) or Cisco Cloud APIC could allow a remote attacker to perform a command injection or file upload attack on an affected system. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

Cisco Application Policy Infrastructure Controller (APIC): before 3.2\(10f\); from 4.0 before 4.2\(7l\); from 5.0 before 5.2\(1g\) — fixed in 3.2\(10f\), 4.2\(7l\), 5.2\(1g\)
Cisco Cloud Application Policy Infrastructure Controller: before 3.2\(10f\); from 4.0 before 4.2\(7l\); from 5.0 before 5.2\(1g\) — fixed in 3.2\(10f\), 4.2\(7l\), 5.2\(1g\)

How to fix

Upgrade to a fixed version: Cisco Application Policy Infrastructure Controller (APIC) 3.2\(10f\), 4.2\(7l\), 5.2\(1g\); Cisco Cloud Application Policy Infrastructure Controller 3.2\(10f\), 4.2\(7l\), 5.2\(1g\). Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-1581 or the next vulnerability affects your stack