What is CVE-2021-23192?

CVE-2021-23192 is a high-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-03-02.

How severe is CVE-2021-23192?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Samba

CVE-2021-23192

A flaw was found in the way samba implemented DCE/RPC. If a client to a Samba server sent a very large DCE/RPC request, and chose to fragment it, an attacker could replace later fragments with their own data, bypassing the signature requirements.

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

Published 2022-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.020 (79.5th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Samba
Samba — versions Affects samba v4.10.0 to 4.15.1, Fixed in samba v4.15.2, v4.14.10 and v4.13.14.

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
www.samba.org/samba/security/CVE-2021-23192.html (Patch, Vendor Advisory)
ubuntu.com/security/CVE-2021-23192 (Third Party Advisory)
security.gentoo.org/glsa/202309-06 (vendor-advisory)

Frequently asked questions

What is CVE-2021-23192?: CVE-2021-23192 is a high-severity vulnerability in Samba, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2022-03-02.
How severe is CVE-2021-23192?: High severity. CVSS v3 base score is 7.5 out of 10.