CVE-2021-20254
6.8
MEDIUM
CVSS 3.1
EPSS 1.8%
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.
How to fix CVE-2021-20254
To remediate CVE-2021-20254, upgrade the affected package to a fixed version below.
- —upgrade to 4.12.15-r0 or later
- —upgrade to 2:4.13.5+dfsg-2 or later
Is CVE-2021-20254 being exploited?
Low — EPSS is 1.8%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 4.12.15-r0
- from 0, < 2:4.13.5+dfsg-2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.8 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |