CVE-2021-43399
HIGH
7.5
CVSS Score
Published: December 8, 2021 at 06:31 PM UTC
Updated: June 17, 2026 at 04:10 AM UTC
1 product affected across 1 vendorYubihsm 2 Software Development Kit
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Severity
HIGH7.5
Exploit prediction
EPSS 1%
Description
The Yubico YubiHSM YubiHSM2 library 2021.08, included in the yubihsm-shell project, does not properly validate the length of some operations including SSH signing requests, and some data operations received from a YubiHSM 2 device.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v ≤ 2021.08
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
References (2)
x_refsource_MISCExploitThird Party Advisory
Source: [email protected]
https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/x_refsource_MISCVendor Advisory
Source: [email protected]
https://www.yubico.com/support/security-advisories/ysa-2021-04/CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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