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CVE-2021-21995

7.5 · HIGH

OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue.

Published Jul 13, 2021CWE-125EPSS 0.96%

Overview

CVE-2021-21995 is a high-severity vulnerability. It was published on July 13, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

OpenSLP as used in ESXi has a denial-of-service vulnerability due a heap out-of-bounds read issue. A malicious actor with network access to port 427 on ESXi may be able to trigger a heap out-of-bounds read in OpenSLP service resulting in a denial-of-service condition.

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.vmware.com/security/advisories/VMSA-2021-0014.htmlRefwww.vmware.com/security/advisories/VMSA-2021-0014.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-21995?

CVE-2021-21995 is a high-severity vulnerability. It was published on July 13, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-21995?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-21995?

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-2021-21995?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-21995 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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