High severity7.5NVD Advisory· Published May 12, 2021· Updated Jun 17, 2026

CVE-2021-20277

Description

A flaw was found in Samba's libldb. Multiple, consecutive leading spaces in an LDAP attribute can lead to an out-of-bounds memory write, leading to a crash of the LDAP server process handling the request. The highest threat from this vulnerability is to system availability.

AI Insight

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

Affected products

Samba (software)/libldbllm-fuzzy
Samba/libldbdescription
osv-coords65 versions
pkg:rpm/opensuse/ldb&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/samba&distro=openSUSE%20Tumbleweed pkg:rpm/opensuse/libapparmor&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/ldb&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS pkg:rpm/suse/samba&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0 pkg:rpm/suse/samba&distro=SUSE%20Manager%20Server%204.0 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%202%2015%20SP2 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOS pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/ldb&distro=SUSE%20Manager%20Proxy%204.0 pkg:rpm/suse/ldb&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Python%202%2015%20SP2 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP3 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP2 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCL pkg:rpm/suse/samba&distro=SUSE%20Manager%20Proxy%204.0 pkg:rpm/suse/samba&distro=SUSE%20Enterprise%20Storage%206 pkg:rpm/suse/krb5&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/apparmor&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP3 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/ldb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/libapparmor&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/talloc-man&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/apparmor&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/krb5&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/libapparmor&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOS pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Availability%20Extension%2015%20SP1 pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSS pkg:rpm/suse/samba&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/ldb&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSS pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSS pkg:rpm/suse/samba&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2 pkg:rpm/suse/ldb&distro=SUSE%20Linux%20Enterprise%20Micro%205.1 pkg:rpm/opensuse/krb5&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/apparmor&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/suse/tdb&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP3 pkg:rpm/opensuse/ldb&distro=openSUSE%20Leap%2015.2 pkg:rpm/opensuse/samba&distro=openSUSE%20Leap%2015.2 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/apparmor&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/sssd&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/talloc&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/talloc-man&distro=openSUSE%20Leap%2015.3 pkg:rpm/opensuse/tevent-man&distro=openSUSE%20Leap%2015.3 pkg:rpm/suse/ldb&distro=SUSE%20Manager%20Server%204.0 pkg:rpm/suse/ldb&distro=SUSE%20Enterprise%20Storage%207 pkg:rpm/suse/samba&distro=SUSE%20Enterprise%20Storage%207
< 2.3.0-1.3+ 64 more
- (no CPE)range: < 2.3.0-1.3
- (no CPE)range: < 4.14.6+git.182.2205d5224e3-1.1
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 2.0.12-3.6.1
- (no CPE)range: < 4.11.14+git.247.8c858f7ee14-4.19.1
- (no CPE)range: < 4.13.6+git.211.555d60b24ba-3.7.1
- (no CPE)range: < 4.11.14+git.247.8c858f7ee14-4.19.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.3.3-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.2
- (no CPE)range: < 2.13.6-150300.3.11.2
- (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: < 2.4.1-150300.3.10.1
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 1.16.1-150300.23.17.3
- (no CPE)range: < 2.3.3-150300.3.3.1
- (no CPE)range: < 0.11.0-150300.3.3.1
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.13.6-150300.3.11.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.9.5+git.432.d9b18c4f390-3.50.1
- (no CPE)range: < 4.13.6+git.211.555d60b24ba-3.7.1
- (no CPE)range: < 4.13.6+git.211.555d60b24ba-3.7.1
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 4.11.14+git.247.8c858f7ee14-4.19.1
- (no CPE)range: < 2.4.1-150300.3.10.1
- (no CPE)range: < 1.19.2-150300.8.3.2
- (no CPE)range: < 2.13.6-150300.3.11.2
- (no CPE)range: < 1.4.4-150300.3.3.2
- (no CPE)range: < 2.0.12-lp152.2.9.1
- (no CPE)range: < 4.11.14+git.247.8c858f7ee14-lp152.3.19.1
- (no CPE)range: < 4.13.6+git.211.555d60b24ba-3.7.1
- (no CPE)range: < 1.4.4-150300.3.3.2
- (no CPE)range: < 0.11.0-150300.3.3.2
- (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
- (no CPE)range: < 1.16.1-150300.23.17.3
- (no CPE)range: < 2.3.3-150300.3.3.2
- (no CPE)range: < 2.3.3-150300.3.3.1
- (no CPE)range: < 0.11.0-150300.3.3.1
- (no CPE)range: < 1.4.6-3.8.1
- (no CPE)range: < 2.2.1-4.3.1
- (no CPE)range: < 4.13.6+git.211.555d60b24ba-3.9.1
Samba (software)/Samba
cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
Range: >=4.0.0,<4.12.13
Debian/linux2 versions
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Fedoraproject/Fedora3 versions
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

Patches

Vulnerability mechanics

References

bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
lists.debian.org/debian-lts-announce/2021/03/msg00036.htmlnvdMailing ListThird Party Advisory
security.gentoo.org/glsa/202105-22nvdThird Party Advisory
security.netapp.com/advisory/ntap-20210326-0007/nvdThird Party Advisory
www.debian.org/security/2021/dsa-4884nvdThird Party Advisory
www.samba.org/samba/security/CVE-2021-20277.htmlnvdVendor Advisory
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VLZ74IF2N75VQSIHBL4B3P5WKWQCXSRY/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X5J3B6PN5XMXF3OHYBNHDKZ3XFSUGY4L/nvd
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZXP3ONIY6MB4C5LDZV4YL5KJCES3UX24/nvd

News mentions

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cvss	0.488
epss	0.003
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000