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CVE-2021-28511

5.8 · MEDIUM

This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass.

Published Aug 5, 2022CWE-284EPSS 0.60%

Overview

CVE-2021-28511 is a medium-severity vulnerability. It was published on August 5, 2022 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

This advisory documents the impact of an internally found vulnerability in Arista EOS for security ACL bypass. The impact of this vulnerability is that the security ACL drop rule might be bypassed if a NAT ACL rule filter with permit action matches the packet flow. This could allow a host with an IP address in a range that matches the range allowed by a NAT ACL and a range denied by a Security ACL to be forwarded incorrectly as it should have been denied by the Security ACL. This can enable an ACL bypass.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078Refwww.arista.com/en/support/advisories-notices/security-advisory/15862-security-advisory-0078

How CyberStrike helps

Frequently asked questions

What is CVE-2021-28511?

CVE-2021-28511 is a medium-severity vulnerability. It was published on August 5, 2022 and has a CVSS 3.1 base score of 5.8 (MEDIUM).

How severe is CVE-2021-28511?

This vulnerability has a CVSS 3.1 base score of 5.8, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-28511?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-28511?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-28511 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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