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Fencer Vulns
low 3.8

CVE-2018-5730 json

MIT krb5 1.6 or later allows an authenticated kadmin with permission to add principals to an LDAP Kerberos database to circumvent a DN cont…

published 2018-03-06 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17499

cvss
3.8
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

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.

Patch / fix

  • mit kerberos_5 5-1.21.2
  • krb5 Debian 14, Debian 13, Debian 12 1.16.1-1

debian advisories DEBIAN-CVE-2018-5730

  • krb5 Ubuntu 14.04 LTS 1.12+dfsg-2ubuntu5.4
  • krb5 Ubuntu 16.04 LTS 1.13.2+dfsg-5ubuntu2.1
  • krb5 Ubuntu 18.04 LTS 1.16-2ubuntu0.1

ubuntu advisories UBUNTU-CVE-2018-5730

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

  • krb5 RHEL 7 1.15.1-34.el7
  • libkadm5 RHEL 7 1.15.1-34.el7
  • krb5-libs RHEL 7 1.15.1-34.el7
  • krb5-pkinit RHEL 7 1.15.1-34.el7
  • krb5-server RHEL 7 1.15.1-34.el7
  • krb5-server-ldap RHEL 7 1.15.1-34.el7
  • krb5-workstation RHEL 7 1.15.1-34.el7

red hat advisories RHSA-2018:3071

  • krb5 SLE Module for Server Applications 15, SLE Module for Basesystem 15 1.15.2-6.6.2
  • krb5 SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 1.6.3-133.49.113.7.1
  • krb5 SLES for SAP 12 SP3, SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2 +6 more 1.12.5-40.23.2

suse advisories SUSE-SU-2019:0175-1SUSE-SU-2018:0859-1SUSE-SU-2018:0846-1

  • krb5 openSUSE Leap 15.0 1.15.2-lp150.5.6.1
  • krb5-mini openSUSE Leap 15.0 1.15.2-lp150.5.6.1

opensuse advisories openSUSE-SU-2019:0139-1

  • krb5 Arch Linux 1.16.1-1

arch linux advisories AVG-586

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-2018-5730 updated cvss 3.8

krb5: DN container check bypass by supplying special crafted data

  • Red Hat Enterprise Linux 5 krb5 Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more Red Hat JBoss Enterprise Application Platform 6 krb5 Red Hat JBoss Enterprise Web Server 2 krb5
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) krb5 1.15.1-34.el7, libkadm5 1.15.1-34.el7, krb5-libs 1.15.1-34.el7, krb5-pkinit 1.15.1-34.el7, krb5-workstation 1.15.1-34.el7 Red Hat Enterprise Linux Client Optional (v. 7) krb5-server 1.15.1-34.el7, krb5-server-ldap 1.15.1-34.el7 Red Hat Enterprise Linux ComputeNode (v. 7) krb5 1.15.1-34.el7, libkadm5 1.15.1-34.el7, krb5-libs 1.15.1-34.el7, krb5-pkinit 1.15.1-34.el7, krb5-workstation 1.15.1-34.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) krb5-server 1.15.1-34.el7, krb5-server-ldap 1.15.1-34.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) krb5 1.15.1-34.el7, libkadm5 1.15.1-34.el7, krb5-libs 1.15.1-34.el7, krb5-pkinit 1.15.1-34.el7, krb5-server 1.15.1-34.el7, krb5-server-ldap 1.15.1-34.el7, +1 more Red Hat Enterprise Linux Server (v. 7) krb5 1.15.1-34.el7, libkadm5 1.15.1-34.el7, krb5-libs 1.15.1-34.el7, krb5-pkinit 1.15.1-34.el7, krb5-server 1.15.1-34.el7, krb5-server-ldap 1.15.1-34.el7, +1 more
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) krb5 1.15.1-34.el7, libkadm5 1.15.1-34.el7, krb5-libs 1.15.1-34.el7, krb5-pkinit 1.15.1-34.el7, krb5-server 1.15.1-34.el7, krb5-server-ldap 1.15.1-34.el7, +1 more
    fixed: vendor fix RHSA-2018:3071
  • Red Hat Enterprise Linux 8 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more Red Hat JBoss Core Services krb5
    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

2.24% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 3.8 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
NVD 2.0 5.5 AV:N/AC:L/Au:S/C:P/I:P/A:N

Classification

Weakness
  • CWE-90 Improper Neutralization of Special Elements used in an LDAP Query

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.