What is CVE-2021-43399?

CVE-2021-43399 is a high-severity vulnerability in Yubico Yubihsm 2 Software Development Kit, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-12-08.

How severe is CVE-2021-43399?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Yubico Yubihsm 2 Software Development Kit

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.

Vulnerability class: Buffer Overflow

EPSS: 0.014 (69.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Yubico Yubihsm_2_software_development_kit
N/a — versions n/a

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)
cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-43399?: CVE-2021-43399 is a high-severity vulnerability in Yubico Yubihsm 2 Software Development Kit, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2021-12-08.
How severe is CVE-2021-43399?: High severity. CVSS v3 base score is 7.5 out of 10.