Description
Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'
Published: 2018-08-28
Score: 5.3 Medium
EPSS: 2.1% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2018-7775 Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or "oracle") as a vulnerability.'
History

Thu, 18 Dec 2025 12:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 13 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.01019}

epss

{'score': 0.01233}


Fri, 14 Feb 2025 01:45:00 +0000

Type Values Removed Values Added
Metrics threat_severity

Low

threat_severity

Moderate


Subscriptions

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Openbsd Openssh
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2025-12-18T11:48:27.405Z

Reserved: 2018-08-28T00:00:00.000Z

Link: CVE-2018-15919

cve-icon Vulnrichment

Updated: 2024-08-05T10:10:05.228Z

cve-icon NVD

Status : Modified

Published: 2018-08-28T08:29:00.207

Modified: 2025-12-18T12:15:53.580

Link: CVE-2018-15919

cve-icon Redhat

Severity : Moderate

Publid Date: 2018-08-28T00:00:00Z

Links: CVE-2018-15919 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses