VULNERABILITY INTELLIGENCE

CVE-2021-20254

CVSS score6.8 MEDIUM
EPSS probability1.62%
CISA KEVNot currently listed
Published2021-05-05
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Weakness classification

  • secalert@redhat.com: CWE-125

Primary references