CVE-2020-24387

HIGH EPSS 74.8%
Published Oct 19, 20205y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Oct 19, 2020 5y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
74.8% percentile
Exploit & Patch Status
Public Exploit Known
No Patch Available

Weaknesses 2

CWE-125 Out-of-bounds Read Memory Safety
CWE-787 Out-of-bounds Write Memory Safety

Affected Products 2

VendorProductVersionRange
yubicoyubihsm-shell* ≤2.0.2
fedoraprojectfedora33any

References 5

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.