CVE-2018-5730

MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to circumvent a DN containership check by supplying both a "linkdn" and "containerdn" database argument, or by supplying a DN string which is a left extension of a container DN string but is not hierarchically within the container DN.

Published: 2018-03-06 Last update: 2025-05-05 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-5730 is rated Low Risk (39.5/100): CVSS Low severity, with medium exploitation likelihood (EPSS 0.58%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2018-5730

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 2026-05-27 0.39% 0.58% +0.18%
2 2025-11-21 1.08% 0.39% -0.68%
3 2025-11-18 — 1.08% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-5730

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.8 3.1 LOW
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N 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:H)
They need powerful rights—admin, root, or similar—before this pays off.
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:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.2 2.5 [email protected]
5.5 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:P/A:N 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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 4.9 [email protected]

Weakness enumeration for CVE-2018-5730

OS Trackers for CVE-2018-5730

vendor priority summary link
debian not yet assigned CVE-2018-5730 not yet assigned priority: Debian including 1 source packages (krb5), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-5730
redhat low — https://access.redhat.com/security/cve/CVE-2018-5730
suse medium CVE-2018-5730 severity moderate: SUSE including 159 source package names (0.9.1:krb5-1.12.5-40.23.2, 1.0.0:krb5-1.12.5-40.23.2, …), 290 product×package rows across 77 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (77 product lines)): Fixed 244, Known Not Affected 46. https://www.suse.com/security/cve/CVE-2018-5730/
ubuntu low CVE-2018-5730 low priority: Ubuntu including 1 source packages (krb5), 11 status rows across 11 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, trusty, upstream, xenial): not-affected 5, released 4, ignored 1, needs-triage 1. https://ubuntu.com/security/CVE-2018-5730

Affected software / configurations for CVE-2018-5730

Vendor Product Version Raw CPE
mit kerberos_5 >= 5-1.6, < 5-1.21.2 cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*
fedoraproject fedora 26 cpe:2.3:o:fedoraproject:fedora:26:*:*:*:*:*:*:*
fedoraproject fedora 27 cpe:2.3:o:fedoraproject:fedora:27:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2018-5730

URL Tags
http://www.securitytracker.com/id/1042071 Broken Link Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHBA-2019:0327 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3071 Third Party Advisory
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891869 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1551082 Issue Tracking Patch Third Party Advisory
https://github.com/krb5/krb5/commit/e1caf6fb74981da62039846931ebdffed71309d1 Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GK5T6JPMBHBPKS7HNGHYUUF4KKRMNSNU/ Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OIFUL3CPM4S5TOXTTOCQ3CUZN6XCXUTR/ Mailing List Third Party Advisory
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