Is CVE-2021-1577 in the CISA KEV catalog?

No. CVE-2021-1577 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-1577?

CVE-2021-1577 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2021-1577?

CVE-2021-1577 has an EPSS score of 1.30% (67th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-1577?

Upgrade application policy infrastructure controller to 5.1(3e) or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-1577

CRITICAL

9.1

CVSS v3

NVD

Description

A vulnerability in an API endpoint of Cisco Application Policy Infrastructure Controller (APIC) and Cisco Cloud Application Policy Infrastructure Controller (Cloud APIC) could allow an unauthenticated, remote attacker to read or write arbitrary files on an affected system. This vulnerability is due to improper access control. An attacker could exploit this vulnerability by using a specific API endpoint to upload a file to an affected device. A successful exploit could allow the attacker to read or write arbitrary files on an affected device.

CWE-284Improper Access Control

How to fix

Remediation Available

application policy infrastructure controllerNVD

Affected:>= 5.0, < 5.1(3e)Fixed in:5.1(3e)CVE-2021-1577derived from NVD

cloud application policy infrastructure controllerNVD

Affected:>= 5.0, < 5.1(3e)Fixed in:5.1(3e)CVE-2021-1577derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.30%probability of exploitation in 30 days

67thpercentile

Moderate risk: more likely to be exploited than 67% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-27350	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-1653	High	7.5	100%	KEV	-
CVE-2023-23752	Medium	5.3	100%	KEV	Fix
CVE-2023-29298	High	7.5	100%	KEV	-
CVE-2023-38205	High	7.5	100%	KEV	-
CVE-2024-27348	Critical	9.8	99%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.