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Fencer Vulns
medium 6.5

CVE-2020-10730 json

A NULL pointer dereference, or possible use-after-free flaw was found in Samba AD LDAP server in versions before 4.10.17, before 4.11.11 an…

published 2020-07-07 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3155

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

A NULL pointer dereference, or possible use-after-free flaw was found in Samba AD LDAP server in versions before 4.10.17, before 4.11.11 and before 4.12.4. Although some versions of Samba shipped with Red Hat Enterprise Linux do not support Samba in AD mode, the affected code is shipped with the libldb package. This flaw allows an authenticated user to possibly trigger a use-after-free or NULL pointer dereference. The highest threat from this vulnerability is to system availability.

Patch / fix

  • samba samba 4.10.17, 4.11.11, 4.12.4
  • samba Debian 14, Debian 13, Debian 12 2:4.12.5+dfsg-1

debian advisories DEBIAN-CVE-2020-10730

  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.17
  • samba Ubuntu 20.04 LTS 2:4.11.6+dfsg-0ubuntu1.3

ubuntu advisories UBUNTU-CVE-2020-10730

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libldb RHEL 8 2.1.3-2.el8
  • ldb-tools RHEL 8 2.1.3-2.el8
  • python3-ldb RHEL 8 2.1.3-2.el8
  • samba storage 3.5 4.11.6-107.el7rhgs
  • ctdb storage 3.5 4.11.6-107.el7rhgs
  • samba-libs storage 3.5 4.11.6-107.el7rhgs
  • samba-pidl storage 3.5 4.11.6-107.el7rhgs
  • libwbclient storage 3.5 4.11.6-107.el7rhgs

red hat advisories RHSA-2020:4568RHSA-2020:3118RHSA-2020:3119

  • samba SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 +1 more 4.10.17+git.203.862547088ca-3.14.1
  • ldb SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.5.8-3.5.1
  • ldb SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1 1.4.6-3.5.2
  • samba SLE Module for Python 2 15 SP2, SLE Module for Basesystem 15 SP2, SLE High Availability Extension 15 SP2 4.11.11+git.180.2cf3b203f07-4.5.1
  • ldb SLE Module for Basesystem 15 SP2 2.0.12-3.3.1
  • samba SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1, SLE High Availability Extension 15 SP1 +1 more 4.9.5+git.343.4bc358522a9-3.38.1

suse advisories SUSE-SU-2020:2673-1SUSE-SU-2020:2067-1SUSE-SU-2020:1948-1SUSE-SU-2020:1913-1

  • ldb openSUSE Tumbleweed 2.3.0-1.3
  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1
  • samba openSUSE Leap 15.2 4.11.11+git.180.2cf3b203f07-lp152.3.6.1
  • ldb openSUSE Leap 15.2 2.0.12-lp152.2.6.1
  • ldb openSUSE Leap 15.1 1.4.6-lp151.2.3.1
  • samba openSUSE Leap 15.2 4.11.11+git.180.2cf3b203f07-lp152.3.3.1
  • ldb openSUSE Leap 15.2 2.0.12-lp152.2.3.1
  • samba openSUSE Leap 15.1 4.9.5+git.343.4bc358522a9-lp151.2.27.1

opensuse advisories openSUSE-SU-2024:10911-1openSUSE-SU-2024:11365-1openSUSE-SU-2020:1313-1openSUSE-SU-2020:1121-1openSUSE-SU-2020:1023-1openSUSE-SU-2020:0984-1

  • samba Alpine 3.10 4.10.17-r0
  • samba Alpine 3.11 4.11.14-r0
  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 4.12.5-r0

alpine advisories ALPINE-CVE-2020-10730

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba Arch Linux 4.12.6-1

arch linux advisories AVG-1202

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10730 updated cvss 6.5

samba: NULL pointer de-reference and use-after-free in Samba AD DC LDAP Server with ASQ, VLV and paged_results

  • Red Hat Enterprise Linux 5 libldb Red Hat Enterprise Linux 6 pyldb, libldb, ldb-tools
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 pyldb, libldb, ldb-tools
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux BaseOS (v. 8) libldb 2.1.3-2.el8, ldb-tools 2.1.3-2.el8, python3-ldb 2.1.3-2.el8
    fixed: vendor fix RHSA-2020:4568
  • Red Hat Gluster 3.5 Samba on RHEL-7 ctdb 4.11.6-107.el7rhgs, samba 4.11.6-107.el7rhgs, samba-libs 4.11.6-107.el7rhgs, samba-pidl 4.11.6-107.el7rhgs, libwbclient 4.11.6-107.el7rhgs, libsmbclient 4.11.6-107.el7rhgs, +12 more
    fixed: vendor fix RHSA-2020:3118
  • Red Hat Gluster 3.5 Samba on RHEL-8 ctdb 4.11.6-107.el8rhgs, samba 4.11.6-107.el8rhgs, samba-libs 4.11.6-107.el8rhgs, samba-pidl 4.11.6-107.el8rhgs, libwbclient 4.11.6-107.el8rhgs, libsmbclient 4.11.6-107.el8rhgs, +12 more
    fixed: vendor fix RHSA-2020:3119

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.46% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • n/a Samba

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.