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CVE-2021-1582

19
FAUCET Score

CVE-2021-1582 describes a stored cross-site scripting (XSS) vulnerability in the web UI of Cisco Application Policy Infrastructure Controller (APIC) and Cisco Cloud APIC. This medium-severity vulnerability (CVSS 5.4) allows an authenticated, remote attacker to inject malicious script due to improper input validation. Successful exploitation could lead to arbitrary script execution within the web interface or access to sensitive browser-based information. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.2\(10f\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
>= 4.0, < 4.2\(7i\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
>= 5.0, < 5.2\(2f\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
< 3.2\(10f\)CPE matchmatch criteria
cpe:2.3:a:cisco:cloud_application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
>= 4.0, < 4.2\(7i\)CPE matchmatch criteria
cpe:2.3:a:cisco:cloud_application_policy_infrastructure_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.60%
Probability of exploitation in next 30 days
EPSS Percentile
45.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0060 is in the 74th percentile among its peer group of 15,224 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

ciscopatch availablevia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-capic-scss-bFT75YrM
PatchVendor Advisory