NVD / CVE Program· CNA redhat

CVE-2020-25719: A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-based authentication.

HighCVSS 7.2 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 29/100)

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: 1.6% (FIRST EPSS); higher than 77.1% of all records.
Anyone who can reach it over the internet can trigger it. Administrator privileges are required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Azure Linux 3.0 ARM 4.18.3-1; Azure Linux 3.0 x64 4.18.3-1.
Mentioned 4 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Azure Linux 3.0 ARM 4.18.3-1; Azure Linux 3.0 x64 4.18.3-1 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

A flaw was found in the way Samba, as an Active Directory Domain Controller, implemented Kerberos name-based authentication. The Samba AD DC, could become confused about the user a ticket represents if it did not strictly require a Kerberos PAC and always use the SIDs found within. The result could include total domain compromise.

Auth bypass

Published: Feb 18, 2022
Updated: Jun 16, 2026
EPSS: 1.6% · 77th percentile
CWE: CWE-287

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.2 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 1.6%

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

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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.

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Affected 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
debian	debian linux	cpe:2.3:o:debian:debian_linux
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
redhat	enterprise linux	cpe:2.3:o:redhat:enterprise_linux
redhat	enterprise linux desktop	cpe:2.3:o:redhat:enterprise_linux_desktop
redhat	enterprise linux eus	cpe:2.3:o:redhat:enterprise_linux_eus
redhat	enterprise linux for ibm z systems	cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems
redhat	enterprise linux for ibm z systems eus	cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus
redhat	enterprise linux for power big endian	cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian
redhat	enterprise linux for power little endian	cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian
redhat	enterprise linux for power little endian eus	cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus

and 5 more

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.

n/a samba
- samba 4.15.2, samba 4.14.10, samba 4.13.14affected

Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

canonical ubuntu linux20.04
canonical ubuntu linux21.04
canonical ubuntu linux21.10
debian debian linux10.0
debian debian linux9.0
fedoraproject fedora33
fedoraproject fedora34
fedoraproject fedora35
redhat enterprise linux7.0
redhat enterprise linux8.0
redhat enterprise linux desktop7.0
redhat enterprise linux eus8.2
redhat enterprise linux eus8.4
redhat enterprise linux for ibm z systems7.0
redhat enterprise linux for ibm z systems8.0
redhat enterprise linux for ibm z systems eus8.2
redhat enterprise linux for ibm z systems eus8.4
redhat enterprise linux for power big endian7.0
redhat enterprise linux for power little endian7.0
redhat enterprise linux for power little endian8.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

+96

Same product

samba: all records

Other 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…KEV
99Now
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…
66This 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…
66This week

Published before and after this one in the same product

← EarlierCVE-2020-25717Feb 18, 2022 · A flaw was found in the way Samba maps domain users to local users.
33Monitor
← EarlierCVE-2020-25718Feb 18, 2022 · A flaw was found in the way samba, as an Active Directory Domain Controller, is able to support an RODC (read-only domain controller).
36Monitor
Later →CVE-2020-25722Feb 18, 2022 · Multiple flaws were found in the way samba AD DC implemented access and conformance checking of stored data.
35Monitor

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
Azure Linux 3.0 ARM	4.18.3-1 · samba	Microsoft (MSRC)
Azure Linux 3.0 x64	4.18.3-1 · samba	Microsoft (MSRC)
almalinux:bind-dyndb-ldap	11.6-2.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:custodia	0.6.0-3.module_el8.6.0+2881+2f24dc92 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-client	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-client-common	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-client-epn	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-client-samba	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-common	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-healthcheck	0.7-6.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-healthcheck-core	0.7-6.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-python-compat	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-selinux	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
almalinux:ipa-server	4.9.6-10.module_el8.5.0+2603+92118e57 · AlmaLinux:8	Package registry (OSV)
alpine:samba	4.13.17-r0 · Alpine:v3.13	Package registry (OSV)
debian:samba	2:4.13.14+dfsg-1 · Debian:12	Package registry (OSV)
opensuse:ldb	2.2.2-3.3.1 · openSUSE:Leap 15.3	Package registry (OSV)
opensuse:samba	4.13.13+git.528.140935f8d6a-3.12.1 · openSUSE:Leap 15.3	Package registry (OSV)
red hat:bind-dyndb-ldap	0:11.6-2.module+el8.4.0+9328+4ec4e316 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:bind-dyndb-ldap-debuginfo	0:11.6-2.module+el8.4.0+9328+4ec4e316 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:bind-dyndb-ldap-debugsource	0:11.6-2.module+el8.4.0+9328+4ec4e316 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:custodia	0:0.6.0-3.module+el8.1.0+4098+f286395e · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-client	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-client-common	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-client-debuginfo	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-client-epn	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-client-samba	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-common	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)
red hat:ipa-debuginfo	0:4.9.6-10.module+el8.5.0+13587+92118e57 · Red Hat:enterprise_linux:8::appstream	Package registry (OSV)

+14

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.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

CVE-2021-441423 days apartThe Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and…
57Plan

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-22-0163 · Feb 21, 2022(Samba Güvenlik Zafiyeti)
TR-22-0009 · Jan 5, 2022(RedHat Güvenlik Güncellemesi)
TR-21-1006 · Dec 17, 2021(RedHat Güvenlik Güncellemesi)
TR-21-0907 · Nov 10, 2021(Samba Güvenlik Güncellemesi)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
Administrator privileges are required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: High
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

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)

ATT&CK techniques

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:46 PM UTC

For records you follow, these changes also arrive as notifications. →

References

bugzilla.redhat.com/show_bug.cgi?id=2019732

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	bind-dyndb-ldap	before 11.6-2.module_el8.5.0+2603+92118e57	11.6-2.module_el8.5.0+2603+92118e57
AlmaLinux:8	custodia	before 0.6.0-3.module_el8.6.0+2881+2f24dc92	0.6.0-3.module_el8.6.0+2881+2f24dc92
AlmaLinux:8	custodia	before 0.6.0-3.module_el8.5.0+2603+92118e57	0.6.0-3.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-client	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-client-common	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-client-epn	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-client-samba	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-common	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-healthcheck	before 0.7-6.module_el8.5.0+2603+92118e57	0.7-6.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-healthcheck-core	before 0.7-6.module_el8.5.0+2603+92118e57	0.7-6.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-python-compat	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-selinux	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-server	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-server-common	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-server-dns	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	ipa-server-trust-ad	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	opendnssec	before 2.1.7-1.module_el8.6.0+2881+2f24dc92	2.1.7-1.module_el8.6.0+2881+2f24dc92
AlmaLinux:8	opendnssec	before 2.1.7-1.module_el8.5.0+2603+92118e57	2.1.7-1.module_el8.5.0+2603+92118e57
AlmaLinux:8	python3-custodia	before 0.6.0-3.module_el8.6.0+2881+2f24dc92	0.6.0-3.module_el8.6.0+2881+2f24dc92
AlmaLinux:8	python3-custodia	before 0.6.0-3.module_el8.5.0+2603+92118e57	0.6.0-3.module_el8.5.0+2603+92118e57
AlmaLinux:8	python3-ipaclient	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	python3-ipalib	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	python3-ipaserver	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57
AlmaLinux:8	python3-ipatests	before 4.9.6-10.module_el8.5.0+2603+92118e57	4.9.6-10.module_el8.5.0+2603+92118e57