Detections
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Echo: samba: security update to 2:4.13.5+dfsg-2

medium Tenable Self-Hosted Container Security Plugin ID 464006

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - A flaw was found in samba. The Samba smbd file server must map Windows group identities (SIDs) into unix
 group ids (gids). The code that performs this had a flaw that could allow it to read data beyond the end
 of the array in the case where a negative cache entry had been added to the mapping cache. This could
 cause the calling code to return those values into the process token that stores the group membership for
 a user. The highest threat from this vulnerability is to data confidentiality and integrity.
 (CVE-2021-20254)

Solution

Update the samba library and its related packages to version 2:4.13.5+dfsg-2 or later.

See Also

https://advisory.echohq.com/cve/CVE-2021-20254

Plugin Details

Severity: Medium

ID: 464006

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.04

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

Vector: CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:N

CVSS Score Source: CVE-2021-20254

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/2/2026

Vulnerability Publication Date: 4/29/2021

Reference Information

CVE: CVE-2021-20254

IAVA: 2021-A-0208-S