Not Using an Unpredictable IV with CBC Mode in Ypsomed mylife Cloud and Ypsomed mylife App - CVE-2021-27499
Published: July 16, 2021
Vulnerability identifier: #VU54921
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-27499
CWE-ID: CWE-329
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the target system.
The vulnerability exists due to the application layer encryption of the communication protocol between the Ypsomed mylife App and mylife Cloud uses non-random IVs. A remote attacker can perform a man-in-the-middle attack to tamper with messages.
Affected software
Ypsomed mylife Cloud
Ypsomed mylife App
Ypsomed mylife App
How to mitigate CVE-2021-27499
Install updates from vendor's website.
Ypsomed mylife Cloud - update to 1.7.2
Ypsomed mylife App - update to 1.7.5
Ypsomed mylife App - update to 1.7.5