CVE-2018-15473

MEDIUMEPSS 100th pctl

5.3

CVSS v3

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.

CWE-362Race Condition

How to fix

Remediation Available

opensshDebian

Fixed in:1:7.7p1-4CVE-2018-15473

opensshUbuntu

Fixed in:1:6.6p1-2ubuntu2.11USN-3809-1

Fixed in:1:7.2p2-4ubuntu2.6USN-3809-1

Fixed in:1:7.6p1-4ubuntu0.1USN-3809-1

openssh-serverUbuntu

Fixed in:1:6.6p1-2ubuntu2.11USN-3809-1

Fixed in:1:7.2p2-4ubuntu2.6USN-3809-1

Fixed in:1:7.6p1-4ubuntu0.1USN-3809-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

98.63%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

References

Patch6

Exploit3

Third-Party Advisory9

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	83%	KEV	Fix
CVE-2023-28126	Medium	5.9	67%	-	-

Common questions

How do I fix CVE-2018-15473?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2018-15473 being actively exploited?

Not that we know of. CVE-2018-15473 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 98.6% is the estimated probability that it will be exploited in the next 30 days. That is higher than 100% of all scored CVEs.

How severe is CVE-2018-15473?

CVE-2018-15473 has a CVSS v3 base score of 5.3, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2018-15473 affect?

Published advisories record a fix for openssh (Debian), openssh (Ubuntu), openssh-server (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-17.