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Fencer Vulns
high 7.2

CVE-2020-25719 json

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

published 2022-02-18 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18373

cvss
7.2
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba samba 4.13.14, 4.14.10, 4.15.2
  • samba Debian 14, Debian 13, Debian 12 2:4.13.14+dfsg-1

debian advisories DEBIAN-CVE-2020-25719

  • samba Ubuntu 20.04 LTS 2:4.13.14+dfsg-0ubuntu0.20.04.1
  • samba Ubuntu 22.04 LTS 2:4.13.14+dfsg-0ubuntu1

ubuntu advisories UBUNTU-CVE-2020-25719

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • pyusb RHEL 8, RHEL 8.4 EUS, RHEL 8.2 EUS 1.0.0-9.module+el8.1.0+4098+f286395e
  • custodia RHEL 8, RHEL 8.4 EUS, RHEL 8.2 EUS 0.6.0-3.module+el8.1.0+4098+f286395e
  • python-qrcode RHEL 8, RHEL 8.4 EUS, RHEL 8.2 EUS 5.1-12.module+el8.1.0+4098+f286395e
  • python-yubico RHEL 8, RHEL 8.4 EUS, RHEL 8.2 EUS 1.3.2-9.module+el8.1.0+4098+f286395e
  • softhsm RHEL 8, RHEL 8.4 EUS 2.6.0-5.module+el8.4.0+10227+076cd560
  • opendnssec RHEL 8, RHEL 8.4 EUS 2.1.7-1.module+el8.4.0+9007+5084bdd8
  • ipa RHEL 7 4.6.8-5.el7_9.10
  • ipa-client RHEL 7 4.6.8-5.el7_9.10

red hat advisories RHSA-2022:0076RHSA-2022:0007RHSA-2021:5195RHSA-2021:5142

  • samba Enterprise Storage 7 4.13.13+git.545.5897c2d94f3-3.12.1
  • ldb Enterprise Storage 7 2.2.2-4.6.1
  • ldb SLE Module for Basesystem 15 SP3, SLE Micro 5.1 2.2.2-3.3.1
  • samba SLE Module for Python 2 15 SP3, SLE Module for Basesystem 15 SP3, SLE High Availability Extension 15 SP3 4.13.13+git.528.140935f8d6a-3.12.1

suse advisories SUSE-SU-2022:0361-1SUSE-SU-2021:3647-1

  • samba openSUSE Tumbleweed 4.15.2+git.193.a4d6307f1fd-1.1
  • ldb openSUSE Leap 15.3 2.2.2-3.3.1
  • samba openSUSE Leap 15.3 4.13.13+git.528.140935f8d6a-3.12.1

opensuse advisories openSUSE-SU-2024:11631-1openSUSE-SU-2021:3647-1

  • softhsm AlmaLinux 8 2.6.0-5.module_el8.5.0+2603+92118e57
  • softhsm AlmaLinux 8 2.6.0-5.module_el8.6.0+2881+2f24dc92
  • custodia AlmaLinux 8 0.6.0-3.module_el8.6.0+2881+2f24dc92
  • custodia AlmaLinux 8 0.6.0-3.module_el8.5.0+2603+92118e57
  • slapi-nis AlmaLinux 8 0.56.6-4.module_el8.6.0+2881+2f24dc92
  • slapi-nis AlmaLinux 8 0.56.6-4.module_el8.5.0+2603+92118e57
  • ipa-client AlmaLinux 8 4.9.6-10.module_el8.5.0+2603+92118e57
  • ipa-common AlmaLinux 8 4.9.6-10.module_el8.5.0+2603+92118e57

almalinux advisories ALSA-2021:5142

  • ipa Rocky Linux 8 4.9.6-10.module+el8.5.0+719+4f06efb6
  • pyusb Rocky Linux 8 1.0.0-9.module+el8.4.0+429+6bd33fea
  • pyusb Rocky Linux 8 1.0.0-9.1.module+el8.7.0+1074+aae18f3a
  • softhsm Rocky Linux 8 2.6.0-5.module+el8.4.0+429+6bd33fea
  • custodia Rocky Linux 8 0.6.0-3.module+el8.4.0+429+6bd33fea
  • slapi-nis Rocky Linux 8 0.56.6-4.module+el8.5.0+675+61f67439
  • slapi-nis Rocky Linux 8 0.56.6-4.module+el8.6.0+796+128eec25
  • opendnssec Rocky Linux 8 2.1.7-1.module+el8.4.0+429+6bd33fea

rocky linux advisories RLSA-2021:5142

  • samba Alpine 3.13 4.13.17-r0
  • samba Alpine 3.14 4.14.12-r0
  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +7 more 4.15.2-r0

alpine advisories ALPINE-CVE-2020-25719

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba Azure Linux 3.0 4.18.3-1

azure linux advisories AZL-36995

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • samba Arch Linux 4.15.2-1

arch linux advisories AVG-2538

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25719 updated cvss 7.2

samba: Samba AD DC did not always rely on the SID and PAC in Kerberos tickets

  • Red Hat Enterprise Linux AppStream (v. 8) ipa 4.9.6-10.module+el8.5.0+13587+92118e57, pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, slapi-nis 0.56.6-4.module+el8.5.0+12583+bf7ffcf6, +29 more
    fixed: vendor fix RHSA-2021:5142
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) ipa 4.8.4-12.module+el8.2.0+13684+242c9723, pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, softhsm 2.4.0-4.module+el8.2.0+5779+a38c524f, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, opendnssec 1.4.14-1.module+el8.1.0+4098+f286395e, slapi-nis 0.56.3-3.module+el8.2.0+13684+242c9723, +28 more
    fixed: vendor fix RHSA-2022:0076
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) ipa 4.9.2-6.module+el8.4.0+13654+33612214, pyusb 1.0.0-9.module+el8.1.0+4098+f286395e, custodia 0.6.0-3.module+el8.1.0+4098+f286395e, softhsm 2.6.0-5.module+el8.4.0+10227+076cd560, opendnssec 2.1.7-1.module+el8.4.0+9007+5084bdd8, ipa-client 4.9.2-6.module+el8.4.0+13654+33612214, +29 more
    fixed: vendor fix RHSA-2022:0007
  • Red Hat Enterprise Linux Client (v. 7) ipa 4.6.8-5.el7_9.10, ipa-client 4.6.8-5.el7_9.10, ipa-common 4.6.8-5.el7_9.10, python2-ipalib 4.6.8-5.el7_9.10, ipa-client-common 4.6.8-5.el7_9.10, ipa-python-compat 4.6.8-5.el7_9.10, +1 more Red Hat Enterprise Linux Client Optional (v. 7) ipa-server 4.6.8-5.el7_9.10, ipa-server-dns 4.6.8-5.el7_9.10, ipa-server-common 4.6.8-5.el7_9.10, python2-ipaserver 4.6.8-5.el7_9.10, ipa-server-trust-ad 4.6.8-5.el7_9.10 Red Hat Enterprise Linux ComputeNode Optional (v. 7) ipa-server 4.6.8-5.el7_9.10, ipa-server-dns 4.6.8-5.el7_9.10, ipa-server-common 4.6.8-5.el7_9.10, python2-ipaserver 4.6.8-5.el7_9.10, ipa-server-trust-ad 4.6.8-5.el7_9.10 Red Hat Enterprise Linux Server (v. 7) ipa 4.6.8-5.el7_9.10, ipa-client 4.6.8-5.el7_9.10, ipa-common 4.6.8-5.el7_9.10, ipa-server 4.6.8-5.el7_9.10, ipa-server-dns 4.6.8-5.el7_9.10, python2-ipalib 4.6.8-5.el7_9.10, +6 more Red Hat Enterprise Linux Workstation (v. 7) ipa 4.6.8-5.el7_9.10, ipa-client 4.6.8-5.el7_9.10, ipa-common 4.6.8-5.el7_9.10, ipa-server 4.6.8-5.el7_9.10, ipa-server-dns 4.6.8-5.el7_9.10, python2-ipalib 4.6.8-5.el7_9.10, +6 more
    fixed: vendor fix RHSA-2021:5195
  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Enterprise Linux 9 ipa, ctdb, samba, libldb, ldb-tools, libnetapi, +46 more Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.69% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.2 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.0 AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

  • n/a samba

Classification

Weakness
  • CWE-287 Improper Authentication
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.