CVE-2021-43399

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

La librería YubiHSM YubiHSM2 versión 2021.08, incluida en el proyecto yubihsm-shell, no comprueba correctamente la longitud de algunas operaciones, incluyendo las peticiones de firma SSH, y algunas operaciones de datos recibidas desde un dispositivo YubiHSM 2

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-11-04 CVE Reserved
2021-12-08 CVE Published
2024-08-04 CVE Updated
2024-08-04 First Exploit
2024-08-23 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://blog.inhq.net/posts/yubico-yubihsm-shell-vuln3	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://www.yubico.com/support/security-advisories/ysa-2021-04	2022-04-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Yubico Search vendor "Yubico"		Yubihsm 2 Software Development Kit Search vendor "Yubico" for product "Yubihsm 2 Software Development Kit"				<= 2021.08 Search vendor "Yubico" for product "Yubihsm 2 Software Development Kit" and version " <= 2021.08"		-		Affected