Is CVE-2021-27499 actively exploited?

No active exploitation of CVE-2021-27499 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-27499 be exploited remotely?

Yes. CVE-2021-27499 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-27499?

CVE-2021-27499 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2021-27499

CWE-329Published: August 2, 2021· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

Ypsomed mylife Cloud, mylife Mobile Application, Ypsomed mylife Cloud: All versions prior to 1.7.2, Ypsomed mylife App: All versions prior to 1.7.5,The application layer encryption of the communication protocol between the Ypsomed mylife App and mylife Cloud uses non-random IVs, which allows man-in-the-middle attackers to tamper with messages.

NVD Source

Technical Analysis

CVE-2021-27499 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.9.