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Fencer Vulns
high 7.5

CVE-2020-10745 json

A flaw was found in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4 in the way it processed NetBios over TCP/IP.

published 2020-07-07 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-3166

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

A flaw was found in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4 in the way it processed NetBios over TCP/IP. This flaw allows a remote attacker could to cause the Samba server to consume excessive CPU use, resulting in a denial of service. This 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-2020-10745

  • samba Ubuntu 16.04 LTS 2:4.3.11+dfsg-0ubuntu0.16.04.28
  • 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
  • samba Ubuntu Pro 14.04 LTS 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm7

ubuntu advisories UBUNTU-CVE-2020-10745

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 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
  • samba SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +2 more 4.4.2-38.33.1
  • samba SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES 12 SP4-LTSS +10 more 4.6.16+git.186.c6d77b0d5a6-3.52.1
  • samba SLES for SAP 15, SLES 15-LTSS, SLE High Performance Computing 15-LTSS +2 more 4.7.11+git.240.76c9942a99f-4.43.1
  • samba SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 +1 more 4.10.5+git.192.26ffbcd7231-3.11.1
  • samba SLES 11 SP4-LTSS, SLE Point of Sale 11 SP3 3.6.3-94.26.1
  • 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

suse advisories SUSE-SU-2020:2673-1SUSE-SU-2020:2312-1SUSE-SU-2020:2066-1SUSE-SU-2020:2065-1SUSE-SU-2020:2036-1SUSE-SU-2020:14437-1

  • 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
  • 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-2024:11365-1openSUSE-SU-2020:1313-1openSUSE-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-2020-10745

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-2020-10745 updated cvss 7.5

samba: Parsing and packing of NBT and DNS packets can consume excessive CPU

  • Red Hat Enterprise Linux 5 samba, samba3x 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

Exploit prediction

3.87% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • n/a Samba

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

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.