CVE-2021-20254

MediumCVSS 6.8/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 6.8/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-125

Affected software

No affected versions have been published.

Timeline

Published: May 5, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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