VulnerabilityModified
CVE-2021-43399
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.
HIGH 7.5EPSS 1.37%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.37% probability · 70th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- yubico/yubihsm 2 software development kit
- Source
- cve@mitre.org
References
- https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/Exploit, Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-04/Vendor Advisory
- https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/Exploit, Third Party Advisory
- https://www.yubico.com/support/security-advisories/ysa-2021-04/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.