DEBIAN-CVE-2021-20254

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2021-20254
Downstream
DLA-2668-1
Published: 05 May 2021, 14:15
Last modified:28 Apr 2026, 20:21

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.8 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

05 May 2021, 14:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:21
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.8CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected Systems

  • debian•samba

    < 2:4.13.5+dfsg-2 | < 2:4.13.5+dfsg-2 | < 2:4.13.5+dfsg-2 | < 2:4.13.5+dfsg-2

References (1)