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Fencer Vulns
medium 6.5

CVE-2018-5710 json

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16.

published 2018-01-16 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-17479

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 78%
public exploits
0
none known

Summary

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. The pre-defined function "strlen" is getting a "NULL" string as a parameter value in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c in the Key Distribution Center (KDC), which allows remote authenticated users to cause a denial of service (NULL pointer dereference) via a modified kadmin client.

Patch / fix

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

debian advisories DEBIAN-CVE-2018-5710

  • 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-2018-5710

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 Alpine 3.24, Alpine 3.23, Alpine 3.22 +15 more 1.15.3-r0

alpine advisories ALPINE-CVE-2018-5710

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2018-5710 updated cvss 6.5

krb5: null pointer deference in strlen function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c

  • 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 Enterprise Linux 7 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more Red Hat Enterprise Linux 8 krb5, libkadm5, krb5-libs, krb5-pkinit, krb5-server, krb5-server-ldap, +1 more Red Hat JBoss Core Services krb5 Red Hat JBoss Enterprise Application Platform 6 krb5
    +1 more products
    Red Hat JBoss Enterprise Web Server 2 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

1.80% chance of exploitation in the next 30 days, higher than 78% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/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

Classification

Weakness

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.

CPEs and fixed versions use Anchore's correction of NVD's data: Improve kerberos 5 affected range consistency.