Medium severity6.8NVD Advisory· Published Aug 23, 2022· Updated Jun 17, 2026

CVE-2021-20316

Description

A flaw was found in the way Samba handled file/directory metadata. This flaw allows an authenticated attacker with permissions to read or modify share metadata, to perform this operation outside of the share.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Samba (software)/Samballm-fuzzy3 versions
(expand)+ 2 more
- (no CPE)
- cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*range: <4.15.0
- (no CPE)
osv-coords81 versions
pkg:rpm/almalinux/libwbclient pkg:rpm/almalinux/libwbclient-devel pkg:rpm/almalinux/python3-samba pkg:rpm/almalinux/samba-common pkg:rpm/almalinux/samba-test pkg:rpm/opensuse/apparmor&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/krb5&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/krb5-mini&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/ldb&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/samba&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/tdb&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/tevent&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/tevent-man&distro=openSUSE%20Leap%2015.3 pkg:rpm/almalinux/libsmbclient-devel pkg:rpm/almalinux/samba-client-libs pkg:rpm/almalinux/samba-common-libs pkg:rpm/almalinux/samba-pidl pkg:rpm/almalinux/samba-vfs-iouring pkg:rpm/suse/krb5&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/talloc&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/tevent&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/tevent-man&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2012%20SP5 pkg:rpm/suse/p11-kit&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5 pkg:rpm/suse/sssd&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/ca-certificates&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/libnettle&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/sssd&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/tdb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%202%2015%20SP3 pkg:rpm/suse/krb5&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3 pkg:rpm/suse/libapparmor&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/sssd&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/talloc&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/tdb&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/tevent&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/gnutls&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/p11-kit&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/sssd&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/yast2-samba-client&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/p11-kit&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/sssd&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/suse/yast2-samba-client&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5 pkg:rpm/almalinux/ctdb pkg:rpm/almalinux/libsmbclient pkg:rpm/almalinux/python3-samba-test pkg:rpm/almalinux/samba pkg:rpm/almalinux/samba-client pkg:rpm/almalinux/samba-common-tools pkg:rpm/almalinux/samba-devel pkg:rpm/almalinux/samba-krb5-printing pkg:rpm/almalinux/samba-libs pkg:rpm/almalinux/samba-test-libs pkg:rpm/almalinux/samba-winbind pkg:rpm/almalinux/samba-winbind-clients pkg:rpm/almalinux/samba-winbind-krb5-locator pkg:rpm/almalinux/samba-winbind-modules pkg:rpm/almalinux/samba-winexe pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/opensuse/libapparmor&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/talloc-man&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/libapparmor&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5 pkg:rpm/opensuse/sssd&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/talloc&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/ca-certificates&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/libnettle&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5 pkg:rpm/suse/talloc-man&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/krb5&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Micro%205.1
< 4.15.5-5.el8+ 80 more
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-8.el8_6
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.4.1-150300.3.10.1
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-150300.3.25.3
- (no CPE)range: < 1.4.4-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.1
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.4.1-150300.3.10.1
- (no CPE)range: < 2.3.3-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.1
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-3.54.1
- (no CPE)range: < 0.23.2-8.3.2
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-3.54.1
- (no CPE)range: < 1.16.1-7.28.9
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-3.54.1
- (no CPE)range: < 1_201403302107-15.3.3
- (no CPE)range: < 3.4.17-8.4.1
- (no CPE)range: < 3.1-21.3.2
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-3.54.1
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-150300.3.25.3
- (no CPE)range: < 1.16.1-150300.23.17.3
- (no CPE)range: < 1.4.4-150300.3.3.2
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-150300.3.25.3
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 1.16.1-150300.23.17.3
- (no CPE)range: < 2.3.3-150300.3.3.2
- (no CPE)range: < 1.4.4-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.2
- (no CPE)range: < 3.4.17-8.4.1
- (no CPE)range: < 0.23.2-8.3.2
- (no CPE)range: < 1.16.1-7.28.9
- (no CPE)range: < 3.1.23-3.3.1
- (no CPE)range: < 2.8.2-56.6.3
- (no CPE)range: < 0.23.2-8.3.2
- (no CPE)range: < 1.16.1-7.28.9
- (no CPE)range: < 3.1.23-3.3.1
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 4.15.5-5.el8
- (no CPE)range: < 2.8.2-56.6.3
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 2.3.3-150300.3.3.1
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 2.8.2-56.6.3
- (no CPE)range: < 1.16.1-150300.23.17.3
- (no CPE)range: < 2.3.3-150300.3.3.2
- (no CPE)range: < 1_201403302107-15.3.3
- (no CPE)range: < 3.1-21.3.2
- (no CPE)range: < 2.3.3-150300.3.3.1
- (no CPE)range: < 4.15.4+git.324.8332acf1a63-150300.3.25.3
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.4.1-150300.3.10.1
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Red Hat/Virtualization Host
cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server3 versions
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_aus:8.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_tus:8.6:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Eus
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

access.redhat.com/security/cve/CVE-2021-20316nvdThird Party Advisory
bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
bugzilla.samba.org/show_bug.cginvdIssue TrackingVendor Advisory
security-tracker.debian.org/tracker/CVE-2021-20316nvdMitigationThird Party Advisory
www.samba.org/samba/security/CVE-2021-20316.htmlnvdVendor Advisory
security.gentoo.org/glsa/202309-06nvd

News mentions

No linked articles in our index yet.

cvss	0.442
epss	0.001
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000