CVE-2018-15473

MediumPublished

OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet...

Published: Aug 17, 2018
Updated: Dec 17, 2025
Assigning CNA: mitre
Evidence observed: Aug 16, 2018

Primary CVSS

5.9/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

98.6%

High · next 30 days

Percentile: 99.9%
Model date: Oct 17, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

OpenSSH through 7.7 is prone to a user enumeration vulnerability due to not delaying bailout for an invalid authenticating user until after the packet containing the request has been fully parsed, related to auth2-gss.c, auth2-hostbased.c, and auth2-pubkey.c.

Sources

Repository evidence: Files: 2 · Repositories: 2

1 Module1 Lab

OpenSSH Username EnumerationLab
openssh/CVE-2018-15473
OpenSSH Username Enumeration (CVE-2018-15473)
Vulhub vulnerability labs
ResearchEvidence observed: Sep 25, 2026Revision: 8fd63916f7a8Related tool
SSH Username EnumerationModule
modules/auxiliary/scanner/ssh/ssh_enumusers.rb
Metasploit Framework modules
DetectionEvidence observed: Sep 26, 2026Revision: b22ce1fbae63Related tool
Declared conditions
- verification: check_not_declared($.auxiliary_scanner/ssh/ssh_enumusers.check)

ssh_Enum_vaildScanner

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