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CVE-2021-1581

29
FAUCET Score

CVE-2021-1581 describes multiple critical vulnerabilities in the web UI and API endpoints of Cisco Application Policy Infrastructure Controller (APIC) and Cisco Cloud APIC. These flaws allow a remote, unauthenticated attacker to execute arbitrary commands or upload malicious files. With a CVSS score of 9.1 (CRITICAL), the vulnerability poses a significant risk due to its low attack complexity and high impact on integrity and availability. Despite its severity, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.2\(10f\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
>= 4.0, < 4.2\(7l\)CPE matchmatch criteria
cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
>= 5.0, < 5.2\(1g\)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\(7l\)CPE matchmatch criteria
cpe:2.3:a:cisco:cloud_application_policy_infrastructure_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.14%
Probability of exploitation in next 30 days
EPSS Percentile
63.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0114 is in the 49th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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-mdvul-HBsJBuvW
PatchVendor Advisory