CVE-2020-24387

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

An issue was discovered in the yh_create_session() function of yubihsm-shell through 2.0.2. The function does not explicitly check the returned session id from the device. An invalid session id would lead to out-of-bounds read and write operations in the session array. This could be used by an attacker to cause a denial of service attack.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-125 CWE-787

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://blog.inhq.net/posts/yubico-libyubihsm-vuln/Exploit, Third Party Advisory
https://developers.yubico.com/yubihsm-shell/Vendor Advisory
https://github.com/Yubico/yubihsm-shellThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
https://www.yubico.com/support/security-advisories/ysa-2020-06/Vendor Advisory
https://blog.inhq.net/posts/yubico-libyubihsm-vuln/Exploit, Third Party Advisory
https://developers.yubico.com/yubihsm-shell/Vendor Advisory
https://github.com/Yubico/yubihsm-shellThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/
https://www.yubico.com/support/security-advisories/ysa-2020-06/Vendor Advisory

Timeline

Published: Oct 19, 2020
Last modified: Jun 17, 2026
NVD status: Modified

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