CVE-2021-1582: Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% 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-79

Description

A vulnerability in the web UI of Cisco Application Policy Infrastructure Controller (APIC) or Cisco Cloud APIC could allow an authenticated, remote attacker to perform a stored cross-site scripting attack on an affected system. This vulnerability is due to improper input validation in the web UI. An authenticated attacker could exploit this vulnerability by sending malicious input to the web UI. A successful exploit could allow the attacker to execute arbitrary script code in the context of the web-based interface or access sensitive, browser-based information.

Affected products

Cisco Application Policy Infrastructure Controller (APIC): before 3.2\(10f\); from 4.0 before 4.2\(7i\); from 5.0 before 5.2\(2f\) — fixed in 3.2\(10f\), 4.2\(7i\), 5.2\(2f\)
Cisco Cloud Application Policy Infrastructure Controller: before 3.2\(10f\); from 4.0 before 4.2\(7i\); from 5.0 before 5.2\(1h\) — fixed in 3.2\(10f\), 4.2\(7i\), 5.2\(1h\)

How to fix

Upgrade to a fixed version: Cisco Application Policy Infrastructure Controller (APIC) 3.2\(10f\), 4.2\(7i\), 5.2\(2f\); Cisco Cloud Application Policy Infrastructure Controller 3.2\(10f\), 4.2\(7i\), 5.2\(1h\). Check the vendor advisory for mitigations.

References

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