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CVE-2021-1582

Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerability

MEDIUM
5.4
CVSS Score
Published: August 25, 2021 at 07:10 PM UTC
Updated: June 17, 2026 at 03:32 AM UTC
2 products affected across 1 vendorApplication Policy Infrastructure ControllerCloud Application Policy Infrastructure Controller

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Application Policy Infrastructure Controller· Cisco
95%
v < 3.2(10f)4.0 ≤ v < 4.2(7i)5.0 ≤ v < 5.2(2f)
Affected range stops below 3.2(10f), so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2(7i), so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2(2f), so it looks safe — our inference, not a vendor statement
Cloud Application Policy Infrastructure Controller· Cisco
95%
v < 3.2(10f)4.0 ≤ v < 4.2(7i)5.0 ≤ v < 5.2(1h)
Affected range stops below 3.2(10f), so it looks safe — our inference, not a vendor statement
Affected range stops below 4.2(7i), so it looks safe — our inference, not a vendor statement
Affected range stops below 5.2(1h), so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCOPatch
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-capic-scss-bFT75YrM

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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