What is CVE-2020-25721?

CVE-2020-25721 is a high-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2022-03-16.

How severe is CVE-2020-25721?

High severity. CVSS v3 base score is 8.8 out of 10.

Improper input validation in Samba

CVE-2020-25721

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.022 (81.8th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.022 · change: +0.001

Affected products

Samba
Samba — versions Affected - All versions since Samba 4.0.0, Fixed-In - v4.15.2, v4.14.10 and v4.13.14

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.samba.org/samba/security/CVE-2020-25721.html (Vendor Advisory)
bugzilla.samba.org/show_bug.cgi (Issue Tracking, Vendor Advisory)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
security.gentoo.org/glsa/202309-06 (vendor-advisory)

Frequently asked questions

What is CVE-2020-25721?: CVE-2020-25721 is a high-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 8.8/10. Published 2022-03-16.
How severe is CVE-2020-25721?: High severity. CVSS v3 base score is 8.8 out of 10.