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CVE-2021-27217

4.4 · MEDIUM

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3.

Published Mar 4, 2021CWE-125EPSS 1.59%

Overview

CVE-2021-27217 is a medium-severity vulnerability. It was published on March 4, 2021 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

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

Refblog.inhq.net/posts/yubico-libyubihsm-vuln2GitHubgithub.com/Yubico/yubihsm-shell/releasesRefwww.yubico.com/support/security-advisories/ysa-2021-01/Refblog.inhq.net/posts/yubico-libyubihsm-vuln2GitHubgithub.com/Yubico/yubihsm-shell/releasesRefwww.yubico.com/support/security-advisories/ysa-2021-01/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-27217?

CVE-2021-27217 is a medium-severity vulnerability. It was published on March 4, 2021 and has a CVSS 3.1 base score of 4.4 (MEDIUM).

How severe is CVE-2021-27217?

This vulnerability has a CVSS 3.1 base score of 4.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-27217?

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-2021-27217?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-27217 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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