CVE-2018-16860

HIGHEPSS 84th pctl

7.5

CVSS v3

Description

A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.

CWE-358

How to fix

Remediation Available

heimdalDebian

Fixed in:7.5.0+dfsg-3CVE-2018-16860

heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

heimdal-clientsUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

heimdal-clients-xUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

heimdal-kcmUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

heimdal-kdcUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

heimdal-serversUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

heimdal-servers-xUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

libgssapi3-heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libkdc2-heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libkrb5-26-heimdalUbuntu

Fixed in:1.6~git20131207+dfsg-1ubuntu1.2+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm1USN-5675-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:7.5.0+dfsg-1ubuntu0.1USN-5675-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

Fixed in:7.7.0+dfsg-1ubuntu1.1USN-5675-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

sambaUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.20+esm1USN-3976-2

This Ubuntu release reached end-of-life on 2019-04-02.

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.20USN-3976-1

This Ubuntu release reached end-of-life on 2021-04-02.

Fixed in:2:4.7.6+dfsg~ubuntu-0ubuntu2.10USN-3976-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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 ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.49%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Vendor Advisory1

samba.org

Third-Party Advisory1

bugzilla.redhat.com

Other references15

Related Vulnerabilities

Other CWE-358 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-1270	Critical	9.8	77%	-	Fix
CVE-2018-1275	Critical	9.8	58%	-	Fix
CVE-2024-7965	High	8.8	19%	KEV	Fix
CVE-2017-15663	High	7.5	13%	-	-
CVE-2016-10229	Critical	9.8	13%	-	Fix
CVE-2024-2174	High	8.8	13%	-	Fix

Common questions

How do I fix CVE-2018-16860?

Published advisories record a fix for 12 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-2018-16860 being actively exploited?

Not that we know of. CVE-2018-16860 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.5% is the estimated probability that it will be exploited in the next 30 days. That is higher than 84% of all scored CVEs.

How severe is CVE-2018-16860?

CVE-2018-16860 has a CVSS v3 base score of 7.5, rated high. 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-2018-16860 affect?

Published advisories record a fix for heimdal (Debian), heimdal (Ubuntu), heimdal-clients (Ubuntu), heimdal-clients-x (Ubuntu), and 8 more. 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 2026-06-17.