What is CVE-2018-7749?

CVE-2018-7749 is a critical-severity vulnerability in Asyncssh Project, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-03-12.

How severe is CVE-2018-7749?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Asyncssh Project

CVE-2018-7749

The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.

Vulnerability class: Broken Authentication

Published 2018-03-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Asyncssh Project

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

groups.google.com/forum/ (mailing-list)
github.com/ronf/asyncssh/commit/c161e26cdc0d41b745b63d9f17b437f073bf7ba4 (Third Party Advisory)

Frequently asked questions

What is CVE-2018-7749?: CVE-2018-7749 is a critical-severity vulnerability in Asyncssh Project, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-03-12.
How severe is CVE-2018-7749?: Critical severity. CVSS v3 base score is 9.8 out of 10.