What’s Vulnerable › Vulnerabilities

CVE-2020-24387

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-10-19 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Fedoraproject Fedora: 33
• Yubico Yubihsm-Shell: through 2.0.2

References

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

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