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Fencer Intel
medium 6.5

CVE-2020-14383 json

A flaw was found in samba's DNS server.

published 5y ago modified 4mo ago also EUVD-2020-6523

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.

Patch / fix

  • samba samba 4.11.15, 4.12.9, 4.13.1
  • samba Debian 14, Debian 13, Debian 12 2:4.13.2+dfsg-2

debian advisories DEBIAN-CVE-2020-14383

  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.32
  • samba Ubuntu 18.04 LTS 2:4.7.6+dfsg~ubuntu-0ubuntu2.21
  • samba Ubuntu 20.04 LTS 2:4.11.6+dfsg-0ubuntu1.6
  • samba Ubuntu Pro 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11

ubuntu advisories UBUNTU-CVE-2020-14383

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

  • samba Enterprise Storage 7 4.13.3+git.181.fc4672a5b81-3.3.1
  • samba SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +10 more 4.6.16+git.248.c833312e640-3.58.1
  • 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.383.7b7f8f14df8-3.47.1
  • samba SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +2 more 4.7.11+git.280.25dfd9a947d-4.51.1
  • samba SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 +1 more 4.10.18+git.219.1d732314d96-3.20.1
  • samba SLE Module for Python 2 15 SP2, SLE Module for Basesystem 15 SP2, SLE High Availability Extension 15 SP2 4.11.14+git.202.344b137b75d-4.14.1

suse advisories SUSE-SU-2021:0185-1SUSE-SU-2020:3093-1SUSE-SU-2020:3092-1SUSE-SU-2020:3087-1SUSE-SU-2020:3082-1SUSE-SU-2020:3081-1

  • samba openSUSE Tumbleweed 4.14.6+git.182.2205d5224e3-1.1
  • samba openSUSE Leap 15.2 4.11.14+git.202.344b137b75d-lp152.3.16.1
  • samba openSUSE Leap 15.1 4.9.5+git.383.7b7f8f14df8-lp151.2.36.1

opensuse advisories openSUSE-SU-2024:11365-1openSUSE-SU-2020:1819-1openSUSE-SU-2020:1811-1

  • samba Alpine 3.11 4.11.16-r0
  • samba Alpine 3.24, Alpine 3.23, Alpine 3.22 +10 more 4.12.9-r0

alpine advisories ALPINE-CVE-2020-14383

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 Azure Linux 3.0 4.18.3-1

azure linux advisories AZL-36990

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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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-2020-14383 updated cvss 6.5

samba: An authenticated user can crash the DCE/RPC DNS with easily crafted records

  • Red Hat Enterprise Linux 6 samba, samba-swat, libsmbclient, samba-client, samba-common, samba-winbind, +4 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Storage 3 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +21 more
    not affected: vulnerable code not present

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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

2.21% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
  • CWE-391 DEPRECATED: Unchecked Error Condition

References

Sources

Fencer Intel 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.