CVE-2021-20254
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 1.6%
exploitation probability
1.6%top 25% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
n/a · sambaReferences
https://bugzilla.redhat.com/show_bug.cgi?id=1949442https://lists.debian.org/debian-lts-announce/2021/05/msg00023.htmlhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3EP2VJ73OVBPVSOSTVOMGIEQA3MWF6F7/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZAF6L2M6CNAJ2YYYGXPWETTW5YLCWTVT/https://security.gentoo.org/glsa/202105-22https://security.netapp.com/advisory/ntap-20210430-0001/https://www.samba.org/samba/security/CVE-2021-20254.html