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.

CVSS v3.1 NVD

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

CVSS v2.0 NVD

7.8 HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS

1.41% chance of exploitation in the next 30 days, 72nd percentile

Published

2021-12-08

Updated

2024-08-04

Proof-of-concept exploits (1)

• https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3/

Security advisories

• https://www.yubico.com/support/security-advisories/ysa-2021-04
• https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3

References

• CVE Record
• NVD entry