---
title: "CVE-2024-39223: Missing key verification in gost"
url: https://erroneo.us/security/cve/CVE-2024-39223/
description: "CVE-2024-39223 (github.com/ginuerzh/gost (Go)): An authentication bypass in the SSH service of gost v2.11.5 allows attackers to intercept communications via…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-07-03
date_modified: 2024-10-25
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-39223"
kev: false
cvss: 9.8
epss: 0.00696
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-39223: Missing key verification in gost

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 0.7% , percentile 52: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 52% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes github.com/ginuerzh/gost (Go) <= 2.11.5, no fixed version listed . Check your lockfile, including transitive dependencies.

## What it is

An authentication bypass in the SSH service of gost v2.11.5 allows attackers to intercept communications via setting the HostKeyCallback function to ssh.InsecureIgnoreHostKey

## Affected packages

- Go `github.com/ginuerzh/gost` <= 2.11.5 → fixed: none listed

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.70% probability of exploitation activity in the next 30 days; percentile 52.

## Sources

- [GitHub Advisory GHSA-8wxx-35qc-vp6r](https://github.com/advisories/GHSA-8wxx-35qc-vp6r)
- [CVE.org record CVE-2024-39223](https://www.cve.org/CVERecord?id=CVE-2024-39223)
- [NVD entry CVE-2024-39223](https://nvd.nist.gov/vuln/detail/CVE-2024-39223)
- [github.com](https://github.com/ginuerzh/gost/issues/1034)
- [github.com](https://github.com/ginuerzh/gost/blob/729d0e70005607dc7c69fc1de62fd8fe21f85355/ssh.go#L229)
- [gist.github.com](https://gist.github.com/nyxfqq/a7242170b1118e78436a62dee4e09e8a)

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Source page: https://erroneo.us/security/cve/CVE-2024-39223/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt