Is CVE-2021-32489 actively exploited?

No active exploitation of CVE-2021-32489 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-32489 be exploited remotely?

Yes. CVE-2021-32489 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-32489?

CVE-2021-32489 has a CVSS score of 4.4 (MEDIUM).

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MEDIUM

CVE-2021-32489

CWE-190Published: May 10, 2021· Updated: Jun 17, 2026

4.4

CVSS v3.1

Official Description

An issue was discovered in the _send_secure_msg() function of Yubico yubihsm-shell through 2.0.3. The function does not correctly validate the embedded length field of an authenticated message received from the device because response_msg.st.len=8 can be accepted but triggers an integer overflow, which causes CRYPTO_cbc128_decrypt (in OpenSSL) to encounter an undersized buffer and experience a segmentation fault. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

NVD Source

Technical Analysis

CVE-2021-32489 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.4.