CVE-2020-25717

Publication date 9 November 2021

Last updated 18 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in the way Samba maps domain users to local users. An authenticated attacker could use this flaw to cause possible privilege escalation.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
samba	26.10 stonking	Fixed in 2:4.13.14+dfsg-0ubuntu1
	26.04 LTS resolute	Fixed in 2:4.13.14+dfsg-0ubuntu1
	25.10 questing	Fixed in 2:4.13.14+dfsg-0ubuntu1
	25.04 plucky	Fixed in 2:4.13.14+dfsg-0ubuntu1
	24.10 oracular	Fixed in 2:4.13.14+dfsg-0ubuntu1
	24.04 LTS noble	Fixed in 2:4.13.14+dfsg-0ubuntu1
	23.10 mantic	Fixed in 2:4.13.14+dfsg-0ubuntu1
	23.04 lunar	Fixed in 2:4.13.14+dfsg-0ubuntu1
	22.10 kinetic	Fixed in 2:4.13.14+dfsg-0ubuntu1
	22.04 LTS jammy	Fixed in 2:4.13.14+dfsg-0ubuntu1
	21.10 impish	Fixed in 2:4.13.14+dfsg-0ubuntu0.21.10.1
	21.04 hirsute	Fixed in 2:4.13.14+dfsg-0ubuntu0.21.04.1
	20.04 LTS focal	Fixed in 2:4.13.14+dfsg-0ubuntu0.20.04.1
	18.04 LTS bionic	Fixed in 2:4.7.6+dfsg~ubuntu-0ubuntu2.26
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Vulnerable

Notes

mdeslaur

The fix for this issue introduces behaviour changes

Severity score breakdown

CVSS version: CVSS v3.0

Base score 8.1 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	8.1 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-5142-1
Samba vulnerabilities
11 November 2021

USN-5174-1
Samba vulnerabilities
6 December 2021