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

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

CVSS v2.0

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

EPSS

1.37% chance of exploitation in the next 30 days, 70th percentile

Published

2021-12-08

Updated

2024-08-04

Proof-of-concept exploits (1)

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

References

• CVE Record
• NVD entry

Related

• CVE-2021-43397
• CVE-2021-43405
• CVE-2021-43396
• CVE-2021-43408
• CVE-2021-43339
• CVE-2021-43409