CVE-2020-14383

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.

Published: 2020-12-01 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-14383 is rated Moderate Risk (55.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.20%). EPSS rose +1.73% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-14383

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.46% 2.20% +1.73%
2 2026-03-19 0.43% 0.46% +0.04%
3 2025-11-30 — 0.43% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-14383

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2020-14383

OS Trackers for CVE-2020-14383

vendor priority summary link
alpine — CVE-2020-14383: 1 source package rows (samba); 90 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 9, open 81. https://security.alpinelinux.org/vuln/CVE-2020-14383
debian not yet assigned CVE-2020-14383 not yet assigned priority: Debian including 1 source packages (samba), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-14383
gentoo normal CVE-2020-14383: 1 GLSA(s) (202012-24), 1 atom(s) (net-fs/samba); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2020-14383
redhat medium — https://access.redhat.com/security/cve/CVE-2020-14383
suse medium CVE-2020-14383 severity moderate: SUSE including 1068 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 2097 product×package rows across 84 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-Azure-BYOS, … (84 product lines)): Fixed 1818, Known Affected 157, Known Not Affected 77, Will Not Fix 45. https://www.suse.com/security/cve/CVE-2020-14383/
ubuntu medium CVE-2020-14383 medium priority: Ubuntu including 1 source packages (samba), 7 status rows across 7 suites (bionic, focal, groovy, hirsute, trusty, upstream, xenial): released 7. https://ubuntu.com/security/CVE-2020-14383

Affected software / configurations for CVE-2020-14383

Vendor Product Version Raw CPE
samba samba >= 4.0.0, < 4.11.15 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
samba samba >= 4.12.0, < 4.12.9 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
samba samba >= 4.13.0, < 4.13.1 cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*
redhat enterprise_linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

References for CVE-2020-14383

cvelogic Threat Intelligence