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MEDIUM

CVE-2018-15473

CVSS v3

5.3

MEDIUM

EPSS Score

98.6 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2018-15473 Red Hat Product Security640 products fixed · 1 known affected

    openssh: User enumeration via malformed packets in authentication requests

    openssh as a component of Red Hat Enterprise Linux 5

  • ICSA-22-349-21 CISA5 known affected

    Siemens SCALANCE X-200RNA Switch Devices

    SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2) · SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2) · SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3)

  • SSA-412672 Siemens ProductCERT5 known affected

    SSA-412672: Multiple OpenSSL and OpenSSH Vulnerabilities in SCALANCE X-200RNA Switch Devices before V3.2.7

    SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2) · SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2) · SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3)

  • RHSA-2019:2143 Red Hat Product Security93 products fixed

    Red Hat Security Advisory: openssh security, bug fix, and enhancement update

  • RHSA-2019:0711 Red Hat Product Security82 products fixed

    Red Hat Security Advisory: openssh security update

Full record on NVD

Description

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.

Technical details

Published
2018-08-17
Exploit-DB
EDB-45210 EDB-45233 EDB-45939

Frequently asked questions

What is CVE-2018-15473?

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.

Is CVE-2018-15473 actively exploited?

Active exploitation of CVE-2018-15473 has not been confirmed. Its EPSS score was 98.6% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-15473?

CVE-2018-15473 has a CVSS v3 base score of 5.3 (MEDIUM severity).

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