CVE-2021-1581

Name: CVE-2021-1581
Creator: NVD / NIST
Published: 2021-08-25T20:15:10.64+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.14%

Last modified Jun 17, 2026

CVE-2021-1581 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

EPSS Probability

1.14%

62.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Cisco	Application Policy Infrastructure Controller	< 3.2\(10f\)
Cisco	Application Policy Infrastructure Controller	>= 4.0, < 4.2\(7l\)
Cisco	Application Policy Infrastructure Controller	>= 5.0, < 5.2\(1g\)
Cisco	Cloud Application Policy Infrastructure Controller	< 3.2\(10f\)
Cisco	Cloud Application Policy Infrastructure Controller	>= 4.0, < 4.2\(7l\)
Cisco	Cloud Application Policy Infrastructure Controller	>= 5.0, < 5.2\(1g\)

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-capic-mdvul-HBsJBuvWPatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-capic-mdvul-HBsJBuvWPatch, Vendor Advisory

Timeline

Published: Aug 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1581?

How severe is CVE-2021-1581?

CVE-2021-1581 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1581?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1581?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST