CVE-2018-15919

Name: CVE-2018-15919
Creator: NVD / NIST
Published: 2018-08-28T08:29:00.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 3.56%

Last modified Jun 17, 2026

CVE-2018-15919 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.'. EPSS estimates a 3.56% chance of exploitation in the next 30 days.

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.'

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

3.56%

87.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	>= 5.9, <= 7.8
Netapp	Cloud Backup	All versions
Netapp	Data Ontap Edge	All versions
Netapp	Ontap Select Deploy	All versions
Netapp	Steelstore	All versions
Netapp	Cn1610 Firmware	All versions

References

http://seclists.org/oss-sec/2018/q3/180Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/105163Third Party Advisory, VDB Entry
https://security.netapp.com/advisory/ntap-20181221-0001/Third Party Advisory
http://seclists.org/oss-sec/2018/q3/180Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/105163Third Party Advisory, VDB Entry
https://security.netapp.com/advisory/ntap-20181221-0001/Third Party Advisory

Timeline

Published: Aug 28, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-15919?

How severe is CVE-2018-15919?

CVE-2018-15919 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 3.56% probability of exploitation in the next 30 days.

How do I fix CVE-2018-15919?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-15919?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST