CVE-2021-23192

Publication date 9 November 2021

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	22.04 LTS jammy	Fixed 2:4.13.14+dfsg-0ubuntu1
	21.10 impish	Fixed 2:4.13.14+dfsg-0ubuntu0.21.10.1
	21.04 hirsute	Fixed 2:4.13.14+dfsg-0ubuntu0.21.04.1
	20.04 LTS focal	Fixed 2:4.13.14+dfsg-0ubuntu0.20.04.1
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

affects 4.10.0 and later

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-5142-1
Samba vulnerabilities
11 November 2021