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CVE-2020-25717

27
FAUCET Score

CVE-2020-25717 is a high-severity flaw in Samba's user mapping functionality, affecting canonical, Debian, Fedora, Red Hat, and Samba products. An authenticated attacker can exploit this vulnerability over the network with low complexity to achieve privilege escalation, potentially leading to high impact on confidentiality and integrity. While no public exploits or active exploitation have been observed, and community discussion is minimal, the potential for significant impact warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
>= 3.0.0, < 4.13.14CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.14.0, < 4.14.10CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
>= 4.15.0, < 4.15.2CPE matchmatch criteria
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.61%
Probability of exploitation in next 30 days
EPSS Percentile
73.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0161 is in the 71st percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (15)

microsoftpatch availablevia msrc
Product: 16863-16823Fixed in: 4.12.5-6
microsoftpatch availablevia msrc
Product: 16864-17084Fixed in: 4.18.3-1
microsoftpatch availablevia msrc
Product: cbl2 samba 4.12.5-6 on CBL Mariner 2.0Fixed in: 4.12.5-6
microsoftpatch availablevia msrc
Product: azl3 samba 4.18.3-1 on Azure Linux 3.0Fixed in: 4.18.3-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 x64Fixed in: 4.18.3-1
microsoftpatch availablevia msrc
Product: Azure Linux 3.0 ARMFixed in: 4.18.3-1
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.5 for RHEL 8Fixed in: samba-0:4.14.5-204.el8rhgs
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: redhat-virtualization-host-0:4.3.21-20220126.0.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Fixed in: redhat-virtualization-host-0:4.4.9-202201072228_8.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Gluster Storage 3.5 for RHEL 7Fixed in: samba-0:4.11.6-114.el7rhgs
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: samba-0:4.10.16-17.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: samba-0:4.14.5-7.el8_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: samba-0:4.11.2-18.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Extended Update SupportFixed in: samba-0:4.13.3-8.el8_4
View patch
redhatpatch availablevia nvd_reference
View patch

Vendor Advisories (3)

microsoft2024-Oct/CVE-2020-25717

CVE-2020-25717

Oct 8, 2024
microsoft2022-Feb/CVE-2020-25717Important

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.

Feb 8, 2022
redhatCVE-2020-25717Important

samba: Active Directory (AD) domain user could become root on domain members

Nov 9, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
security.gentoo.org / glsa/202309-06
samba.org / samba/security/CVE-2020-25717.html
MitigationVendor Advisory