All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delega
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 2.6% (FIRST EPSS); higher than 85.6% of all records.
- Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: samba (Alpine:v3.10) 4.10.11-r0; samba (Alpine:v3.11) 4.11.3-r0; heimdal (Alpine:v3.14) 7.7.1-r0.
- Mentioned 2 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to samba (Alpine:v3.10) 4.10.11-r0; samba (Alpine:v3.11) 4.11.3-r0; heimdal (Alpine:v3.14) 7.7.1-r0 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the S4U (MS-SFU) Kerberos delegation model includes a feature allowing for a subset of clients to be opted out of constrained delegation in any way, either S4U2Self or regular Kerberos authentication, by forcing all tickets for these clients to be non-forwardable. In AD this is implemented by a user attribute delegation_not_allowed (aka not-delegated), which translates to disallow-forwardable. However the Samba AD DC does not do that for S4U2Self and does set the forwardable flag even if the impersonated client has the not-delegated flag set.
- Published
- Dec 10, 2019
- Updated
- Jun 16, 2026
- EPSS
- 2.6% · 85th percentile
- CWE
- CWE-285
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.6%
CNA vs NVD score
- NVD
- 5.4
- CNA · redhat
- 5.4
- agree
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| samba | samba | cpe:2.3:a:samba:samba |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
| canonical | ubuntu linux | cpe:2.3:o:canonical:ubuntu_linux |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| opensuse | leap | cpe:2.3:o:opensuse:leap |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- canonical ubuntu linux14.04
- canonical ubuntu linux16.04
- canonical ubuntu linux18.04
- canonical ubuntu linux19.04
- canonical ubuntu linux19.10
- debian debian linux10.0
- debian debian linux9.0
- fedoraproject fedora30
- fedoraproject fedora31
- opensuse leap15.1
- samba samba4.11.0 and later · before 4.11.3
- samba samba4.10.0 and later · before 4.10.11
- samba samba4.0.0 and later · before 4.9.17
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
Red Hat samba
- all versions 4.11.x before 4.11.3, all versions 4.10.x before 4.10.11, all versions 4.x.x before 4.9.17affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.10 | samba | from 4.0.0 · before 4.10.11-r0 | 4.10.11-r0 |
| Alpine:v3.11 | samba | from 4.0.0 · before 4.11.3-r0 | 4.11.3-r0 |
| Alpine:v3.14 | heimdal | before 7.7.1-r0 | 7.7.1-r0 |
| Debian:10 | heimdal | before 7.5.0+dfsg-3+deb10u1 | 7.5.0+dfsg-3+deb10u1 |
| Debian:12 | heimdal | before 7.7.0+dfsg-1 | 7.7.0+dfsg-1 |
| Debian:12 | samba | before 2:4.11.3+dfsg-1 | 2:4.11.3+dfsg-1 |
| Debian:9 | samba | before 2:4.5.16+dfsg-1+deb9u4 | 2:4.5.16+dfsg-1+deb9u4 |
| openSUSE:Leap 15.1 | samba | before 4.9.5+git.224.86a8e66adea-lp151.2.12.1 | 4.9.5+git.224.86a8e66adea-lp151.2.12.1 |
| SUSE:Linux Enterprise High Availability Extension 12 SP5 | samba | before 4.10.17+git.203.862547088ca-3.14.1 | 4.10.17+git.203.862547088ca-3.14.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 | samba | before 4.7.11+git.202.6edee83fb34-4.34.1 | 4.7.11+git.202.6edee83fb34-4.34.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP1 | samba | before 4.9.5+git.224.86a8e66adea-3.18.1 | 4.9.5+git.224.86a8e66adea-3.18.1 |
| SUSE:Linux Enterprise Software Development Kit 12 SP5 | ldb | before 1.5.8-3.5.1 | 1.5.8-3.5.1 |
| SUSE:Package Hub 15 SP3 | libheimdal | before 7.8.0-bp153.2.4.1 | 7.8.0-bp153.2.4.1 |
| SUSE:Package Hub 15 SP3 | libheimdal | before 7.8.0-bp153.2.4.1 | 7.8.0-bp153.2.4.1 |
| SUSE:Package Hub 15 SP4 | libheimdal | before 7.8.0-bp154.2.4.1 | 7.8.0-bp154.2.4.1 |
| SUSE:Package Hub 15 SP4 | libheimdal | before 7.8.0-bp154.2.4.1 | 7.8.0-bp154.2.4.1 |
Same product
samba: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-7494Samba since version 3.5.0 and before 4.6.4, 4.5.10 and 4.4.14 is vulnerable to remote code execution vulnerability, allowing a malicious cliKEV99Now
- CVE-2015-0240The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x before 4.0.25, 4.1.x before 4.1.17, and 4.2.x befor66This week
- CVE-2003-0085Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in Samba before 2.2.8, and Samba-TNG before 0.3.1, al66This week
Published before and after this one in the same product
- ← EarlierCVE-2019-14847Nov 6, 2019 · A flaw was found in samba 4.0.0 before samba 4.9.15 and samba 4.10.x before 4.10.10.20Monitor
- ← EarlierCVE-2019-14861Dec 10, 2019 · All Samba versions 4.x.x before 4.9.17, 4.10.x before 4.10.11 and 4.11.x before 4.11.3 have an issue, where the (poorly named) dnsserver RPC22Monitor
- Later →CVE-2011-3585Dec 31, 2019 · Multiple race conditions in the (1) mount.cifs and (2) umount.cifs programs in Samba 3.6 allow local users to cause a denial of service (mou18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:heimdal | 7.7.1-r0 · Alpine:v3.14 | Package registry (OSV) |
| alpine:samba | 4.10.11-r0 · Alpine:v3.10 | Package registry (OSV) |
| debian:heimdal | 7.7.0+dfsg-1 · Debian:12 | Package registry (OSV) |
| debian:samba | 2:4.11.3+dfsg-1 · Debian:12 | Package registry (OSV) |
| opensuse:libheimdal | 7.8.0-bp154.2.4.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:samba | 4.9.5+git.224.86a8e66adea-lp151.2.12.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| suse:ldb | 1.5.8-3.5.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5 | Package registry (OSV) |
| suse:libheimdal | 7.8.0-bp154.2.4.1 · SUSE:Package Hub 15 SP4 | Package registry (OSV) |
| suse:samba | 4.7.11+git.202.6edee83fb34-4.34.1 · SUSE:Linux Enterprise Module for Basesystem 15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-760 · Sep 18, 2020(Samba Güvenlik Güncellemeleri Yayınladı)
- TR-19-315 · Dec 10, 2019(Samba Güvenlik Güncellemeleri Yayınladı)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- low · data can be read
- Integrity
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-285 · Improper AuthorizationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Accessing Functionality Not Properly Constrained by ACLsCAPEC-1likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Directory IndexingCAPEC-127likelihood: High · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
- Using Malicious FilesCAPEC-17likelihood: High · Very High
- Manipulating Opaque Client-based Data TokensCAPEC-39likelihood: High · Medium
- Bypassing ATA Password SecurityCAPEC-402
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
- Data from Local SystemT1005
- Query RegistryT1012
- File and Directory DiscoveryT1083
- Access Token Manipulation:Token Impersonation/TheftT1134.001
- Use Alternate Authentication Material:Web Session CookieT1550.004
- Unsecured Credentials: Credentials in RegistryT1552.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Data Manipulation: Transmitted Data ManipulationT1565.002
- Hijack Execution Flow: Executable Installer File Permissions WeaknessT1574.005
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
- Hijack Execution Flow: ServicesFile Permissions WeaknessT1574.010
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (13 more)Show less
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14870
- lists.debian.org/debian-lts-announce/2021/05/msg00023.html
- lists.debian.org/debian-lts-announce/2022/11/msg00034.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PJH3ROOFYMOATD2UEPC47P5RPBDTY77E/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WNKA4YIPV7AZR7KK3GW6L3HKGHSGJZFE/
- security.gentoo.org/glsa/202003-52
- security.gentoo.org/glsa/202310-06
- security.netapp.com/advisory/ntap-20191210-0002/
- security.netapp.com/advisory/ntap-20230216-0008/
- usn.ubuntu.com/4217-1/
- usn.ubuntu.com/4217-2/
- www.samba.org/samba/security/CVE-2019-14870.html
- www.synology.com/security/advisory/Synology_SA_19_40
Vendor advisories and official records. Exploit/PoC links are deliberately left out.