How severe is CVE-2021-1477?

CVE-2021-1477 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2021-1477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-1477?

CVE-2021-1477 affects Cisco Secure Firewall Management Center. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-1477?

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

When was CVE-2021-1477 published?

CVE-2021-1477 was published on 2021-04-29 and last updated on 2026-06-17.

CVE-2021-1477

CVE-2021-1477 is a medium-severity vulnerability in Cisco Secure Firewall Management Center with a CVSS 3.x base score of 4.3. 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 4.3)
CVSS v2: 4.0
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Cisco Secure Firewall Management Center
Published: 2021-04-29
Last modified: 2026-06-17

Description

A vulnerability in an access control mechanism of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to access services beyond the scope of their authorization. This vulnerability is due to insufficient enforcement of access control in the affected software. An attacker could exploit this vulnerability by directly accessing the internal services of an affected device. A successful exploit could allow the attacker to overwrite policies and impact the configuration and operation of the affected device.

Frequently asked questions

What is CVE-2021-1477?: A vulnerability in an access control mechanism of Cisco Firepower Management Center (FMC) Software could allow an authenticated, remote attacker to access services beyond the scope of their authorization. This vulnerability is due to insufficient enforcement of access control in the affected software. An attacker could exploit this vulnerability by directly accessing the internal services of an affected device. A successful exploit could allow the attacker to overwrite policies and impact the configuration and operation of the affected device.
How severe is CVE-2021-1477?: CVE-2021-1477 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2021-1477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-1477?: CVE-2021-1477 affects Cisco Secure Firewall Management Center. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-1477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-1477 published?: CVE-2021-1477 was published on 2021-04-29 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fmc-iac-pZDMQ4wC

Affected products (1)

cpe:2.3:a:cisco:secure_firewall_management_center:*:*:*:*:*:*:*:*

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