How severe is CVE-2021-1581?

CVE-2021-1581 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2021-1581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1581?

CVE-2021-1581 primarily affects Cisco Application Policy Infrastructure Controller. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-1581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-1581 published?

CVE-2021-1581 was published on 2021-08-25 and last updated on 2026-06-17.

CVE-2021-1581

CVE-2021-1581 is a medium-severity vulnerability in Cisco Application Policy Infrastructure Controller with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.4
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Cisco Application Policy Infrastructure Controller
Published: 2021-08-25
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-1581?: 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.
How severe is CVE-2021-1581?: CVE-2021-1581 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2021-1581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1581?: CVE-2021-1581 primarily affects Cisco Application Policy Infrastructure Controller. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-1581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-1581 published?: CVE-2021-1581 was published on 2021-08-25 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-capic-mdvul-HBsJBuvW

Affected products (2)

cpe:2.3:a:cisco:application_policy_infrastructure_controller:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:cloud_application_policy_infrastructure_controller:*:*:*:*:*:*:*:*

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