BlackTreeCVE Intelligence
← Back to the CVE catalogue
Full vulnerability report · 2019
CVE-2018-16860High confidence

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

SAMBA · samba

7.5HighCVSS 3.0
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Mitigation available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 2.49% for the current model date.

Compensating controls

  • Apply the linked authoritative mitigation while planning the permanent fix.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs SAMBA samba and falls inside the recorded affected range.
  2. Recheck the vendor advisory before scheduling a change because no verified fixed version is currently retained.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Alpine, Debian findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

14 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Alpine v3.23v3.23 · mainheimdalVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.7.5.3-r4Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.23v3.23 · mainsambaVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.4.10.3-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainheimdalVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.7.5.3-r4Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.22v3.22 · mainsambaVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.4.10.3-r0Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainheimdalVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.7.5.3-r4Alpine Security Database ↗Source updated 3 Oct 2026
Alpine v3.21v3.21 · mainsambaVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.4.10.3-r0Alpine Security Database ↗Source updated 3 Oct 2026
Debian trixietrixie · sourceheimdalVendor fix publishedDebian records a fixed source-package version for this release.7.5.0+dfsg-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian trixietrixie · sourcesambaVendor fix publishedDebian records a fixed source-package version for this release.2:4.9.5+dfsg-4Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourceheimdalVendor fix publishedDebian records a fixed source-package version for this release.7.5.0+dfsg-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcesambaVendor fix publishedDebian records a fixed source-package version for this release.2:4.9.5+dfsg-4Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourceheimdalVendor fix publishedDebian records a fixed source-package version for this release.7.5.0+dfsg-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcesambaVendor fix publishedDebian records a fixed source-package version for this release.2:4.9.5+dfsg-4Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourceheimdalVendor fix publishedDebian records a fixed source-package version for this release.7.5.0+dfsg-3Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcesambaVendor fix publishedDebian records a fixed source-package version for this release.2:4.9.5+dfsg-4Debian Security Tracker ↗Source updated 5 Oct 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2018-8651

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Mitigation available
01

What, why and how

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.

What

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.

Why

The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improperly Implemented Security Check for Standard → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-358 ↗

CWE-358: Improperly Implemented Security Check for Standard. The product does not implement or incorrectly implements one or more security-relevant checks as specified by the design of a standardized algorithm, protocol, or technique.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkCWE-358
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Canadian Centre for Cyber Security · English · AV19-094Samba security advisory

The Samba Team has released a security advisory to address a vulnerability in their Samba software. A man-in-the-middle attack could allow for control of the affected system. CCCS encourages users and administrators to review the Samba Security Releases webpage and apply the necessary updates:

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-356Multiples vulnérabilités dans les produits Apple

du 22 juillet 2019 https://support.apple.com/en-us/HT210348 Bulletin de sécurité Apple HT210351 du 22 juillet 2019 https://support.apple.com/en-us/HT210351 Bulletin de sécurité Apple HT210353 du 22 juillet 2019 https://support.apple.com/en-us/HT210353 Bulletin de sécurité Apple HT210355 du 22 juillet 2019 https://support.apple.com/en-us/HT210355 Bulletin de sécurité Apple HT210356 du 23 juillet 2019 https://support.apple.com/en-us/HT210356 Bulletin de sécurité Apple HT210357 du 23 juillet 2019 https://support.apple.com/en-us/HT210357 Bulletin de sécurité Apple HT210358 du 23 juillet 2019 https://support.apple.com/en-us/HT210358 Référence CVE CVE-2018-16860 https://www.cve.org/CVERecord?id=CVE-2018-16860 Référence CVE CVE-2018-19860 https://www.cve.org/CVERecord?id=CVE-2018-19860 Référence CVE CVE-2019-13118 https://www.cve.org/CVERecord?id=CVE-2019-13118 Référence CVE CVE-2019-8624 https://www.cve.org/CVERecord?id=CVE-2019-8624 Référence CVE CVE-2019-8641 https://www.cve.org/CVERecord?id=CVE-2019-8641 Référence CVE CVE-2019-8644 https://www.cve.org/CVERecord?id=CVE-2019-8644 Référence CVE CVE-2019-8646 https://www.cve.org/CVERecord?id=CVE-2019-8646 Référence CVE CVE-2019-8647 https://www.cve.org/CVERecord?id=CVE-2019-8647 Référence CVE CVE-2019-8648 https://www.cve.org/CVERecord?id=CVE-2019-86

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-206Vulnérabilité dans Samba

Une vulnérabilité a été découverte dans Samba . Elle permet à un attaquant de provoquer un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-015994Heimdal におけるセキュリティチェックに関する脆弱性

Heimdal には、セキュリティチェックに関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Mitigation available
Affected
samba: 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8, 4.10.x up to, excluding 4.10.3
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
Apply the mitigation in the linked authoritative guidance while planning the vendor's permanent fix.
Workaround
A mitigation or workaround reference is available from the source linked below; validate it against the affected product and version.
04

Evidence and provenance

Published 31 Jul 2019 · Last source change 5 Aug 2024, 10:32 UTC · CWE-358 · Improperly Implemented Security Check for Standard

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2018-8651
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2018-8651 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2018-8651"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added mitigation: samba.org/CVE-2018-16860.html; added remediation: samba.org/CVE-2018-16860.html; removed vendor advisory: lists.opensuse.org/msg00026.html; removed vendor advisory: security.gentoo.org/202003-52.
    Before
    vendor advisory: lists.opensuse.org/msg00026.html · vendor advisory: security.gentoo.org/202003-52
    After
    mitigation: samba.org/CVE-2018-16860.html · remediation: samba.org/CVE-2018-16860.html
    samba.org ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    samba.org ↗
  4. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Mitigation reference recorded
ENISA EUVD · EUVD-2018-8651↗Mitigation reference↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2018-16860 · cve.blacktree.nl