CVE-2024-39223Network attack vector

SSH traffic interception via disabled host-key verification

Published Jul 3, 2024 · Updated Oct 25, 2024

Authentication bypass in GOST 2.11.5 and earlier allows man-in-the-middle attackers to intercept SSH forwarding communications. The sshForwardTransporter Handshake method assigns ssh.InsecureIgnoreHostKey as HostKeyCallback, accepting every presented server host key. Exploitation requires a position on the network path to an SSH forwarding endpoint and permits undetected interception of tunneled data.

CVSS severity9.8
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in GOST 2.11.5 and earlier allows man-in-the-middle attackers to intercept SSH forwarding communications. The sshForwardTransporter Handshake method assigns ssh.InsecureIgnoreHostKey as HostKeyCallback, accepting every presented server host key. Exploitation requires a position on the network path to an SSH forwarding endpoint and permits undetected interception of tunneled data.

The record

CVE
CVE-2024-39223
Published
Jul 3, 2024
Updated
Oct 25, 2024
Vendor
Ginuerzh
Product
GOST
Classifications
CWE-639, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.11.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ginuerzh · GOSTversion=0 <=2.11.5

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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