CVE-2021-27217

EPSS 1.6%

Vexday Risk Score

3Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS —EPSS 1.6%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

04 Mar 2021Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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. Out-of-bounds reads performed by aes_remove_padding() can crash the running process, depending on the memory layout. This could be used by an attacker to cause a client-side denial of service. The yubihsm-shell project is included in the YubiHSM 2 SDK product.

Affected products

n/a · n/a

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References

https://blog.inhq.net/posts/yubico-libyubihsm-vuln2 https://github.com/Yubico/yubihsm-shell/releases https://www.yubico.com/support/security-advisories/ysa-2021-01/