What’s Vulnerable › Vulnerabilities

CVE-2021-32489

• Severity: medium (CVSS 4.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-05-10 · updated 2026-06-17
• Weakness: CWE-190

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.

Affected products

• Yubico Yubihsm-Shell: through 2.0.3

References

• https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pending
• https://blog.inhq.net/posts/yubico-libyubihsm-vuln2/#second-attack-variant-cve-pending

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