What is CVE-2020-25719?

CVE-2020-25719 is a high-severity vulnerability in Samba, classified under Improper Authentication. CVSS score: 7.2/10. Published 2022-02-18.

How severe is CVE-2020-25719?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2020-25719 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Samba

CVE-2020-25719

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.

Vulnerability class: Broken Authentication

Published 2022-02-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Samba
Canonical Ubuntu Linux — versions 20.04, 21.04, 21.10
Debian Linux — versions 9.0, 10.0
Fedoraproject Fedora — versions 33, 34, 35
Red Hat Enterprise Linux — versions 7.0, 8.0
Red Hat Enterprise Linux Desktop — versions 7.0
Red Hat Enterprise Linux Eus — versions 8.2, 8.4
Red Hat Enterprise Linux For IBM Z Systems — versions 7.0, 8.0
Red Hat Enterprise Linux For IBM Z Systems Eus — versions 8.2, 8.4
Red Hat Enterprise Linux For Power Big Endian — versions 7.0

Weakness classification (CWE)

Public proof-of-concept exploits

Live-Hack-CVE/CVE-2020-25719

References

bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
www.samba.org/samba/security/CVE-2020-25719.html (Mitigation, Vendor Advisory)
security.gentoo.org/glsa/202309-06 (vendor-advisory)

Frequently asked questions

What is CVE-2020-25719?: CVE-2020-25719 is a high-severity vulnerability in Samba, classified under Improper Authentication. CVSS score: 7.2/10. Published 2022-02-18.
How severe is CVE-2020-25719?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2020-25719 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.