CVE-2020-25721

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-16 · updated 2026-06-17
Weakness: CWE-20

Description

Kerberos acceptors need easy access to stable AD identifiers (eg objectSid). Samba as an AD DC now provides a way for Linux applications to obtain a reliable SID (and samAccountName) in issued tickets.

Affected products

Samba: from 4.13.0 before 4.13.14; from 4.14.0 before 4.14.10; from 4.15.0 before 4.15.2 — fixed in 4.13.14, 4.14.10, 4.15.2

How to fix

Upgrade to a fixed version: Samba 4.13.14, 4.14.10, 4.15.2. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2021728
https://bugzilla.samba.org/show_bug.cgi?id=14725
https://security.gentoo.org/glsa/202309-06
https://www.samba.org/samba/security/CVE-2020-25721.html
https://bugzilla.redhat.com/show_bug.cgi?id=2021728
https://bugzilla.samba.org/show_bug.cgi?id=14725
https://security.gentoo.org/glsa/202309-06
https://www.samba.org/samba/security/CVE-2020-25721.html

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