CVE-2018-7750

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 27.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-03-13 · updated 2026-06-17
Weakness: CWE-287

Description

transport.py in the SSH server implementation of Paramiko before 1.17.6, 1.18.x before 1.18.5, 2.0.x before 2.0.8, 2.1.x before 2.1.5, 2.2.x before 2.2.3, 2.3.x before 2.3.2, and 2.4.x before 2.4.1 does not properly check whether authentication is completed before processing other requests, as demonstrated by channel-open. A customized SSH client can simply skip the authentication step.

Affected products

Debian Linux: 8.0, 9.0
Paramiko: before 1.17.6; from 1.18.0 before 1.18.5; from 2.0.0 before 2.0.8; from 2.1.0 before 2.1.5; from 2.2.0 before 2.2.3; from 2.3.0 before 2.3.2 — fixed in 1.17.6, 1.18.5, 2.0.8, 2.1.5, 2.2.3, 2.3.2
RedHat Ansible Engine: 2.0, 2.4
CloudForms: 4.5, 4.6
RedHat Enterprise Linux Desktop: 6.0
RedHat Enterprise Linux Server: 6.0, 7.0
RedHat Enterprise Linux Server Aus: 6.4, 6.5, 6.6
RedHat Enterprise Linux Server Eus: 6.7
RedHat Enterprise Linux Server Tus: 6.6
RedHat Enterprise Linux Workstation: 6.0
RedHat Virtualization: 4.1

How to fix

Upgrade to a fixed version: Paramiko 1.17.6, 1.18.5, 2.0.8, 2.1.5. Check the vendor advisory for mitigations.

References

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