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Fencer Vulns
medium 6.5

CVE-2017-11368 json

In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sending invalid S4U2Self or S4U2…

published 2017-08-09 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-2995

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.4%
EPSS 2.4% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sending invalid S4U2Self or S4U2Proxy requests.

Patch / fix

  • mit kerberos_5 1.16
  • mit krb5 1.16
  • krb5 Debian 14, Debian 13, Debian 12 1.15.1-2

debian advisories DEBIAN-CVE-2017-11368

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

ubuntu advisories UBUNTU-CVE-2017-11368

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 1.15.1-18.el7
  • libkadm5 RHEL 7 1.15.1-18.el7
  • krb5-libs RHEL 7 1.15.1-18.el7
  • krb5-pkinit RHEL 7 1.15.1-18.el7
  • krb5-server RHEL 7 1.15.1-18.el7
  • krb5-server-ldap RHEL 7 1.15.1-18.el7
  • krb5-workstation RHEL 7 1.15.1-18.el7

red hat advisories RHSA-2018:0666

  • krb5 openSUSE Tumbleweed 1.19.2-2.2

opensuse advisories openSUSE-SU-2024:10899-1

  • krb5 Arch Linux 1.15.2-1

arch linux advisories AVG-414

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-2017-11368 updated cvss 6.5

krb5: Invalid S4U2Self or S4U2Proxy request causes assertion failure

  • Red Hat Enterprise Linux 6 krb5, libkadm5, krb5-libs, krb5-server, krb5-server-ldap, krb5-workstation, +1 more
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux Client (v. 7) krb5 1.15.1-18.el7, libkadm5 1.15.1-18.el7, krb5-libs 1.15.1-18.el7, krb5-pkinit 1.15.1-18.el7, krb5-workstation 1.15.1-18.el7 Red Hat Enterprise Linux Client Optional (v. 7) krb5-server 1.15.1-18.el7, krb5-server-ldap 1.15.1-18.el7 Red Hat Enterprise Linux ComputeNode (v. 7) krb5 1.15.1-18.el7, libkadm5 1.15.1-18.el7, krb5-libs 1.15.1-18.el7, krb5-pkinit 1.15.1-18.el7, krb5-workstation 1.15.1-18.el7 Red Hat Enterprise Linux ComputeNode Optional (v. 7) krb5-server 1.15.1-18.el7, krb5-server-ldap 1.15.1-18.el7 Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) krb5 1.15.1-18.el7, libkadm5 1.15.1-18.el7, krb5-libs 1.15.1-18.el7, krb5-pkinit 1.15.1-18.el7, krb5-server 1.15.1-18.el7, krb5-server-ldap 1.15.1-18.el7, +1 more Red Hat Enterprise Linux Server (v. 7) krb5 1.15.1-18.el7, libkadm5 1.15.1-18.el7, krb5-libs 1.15.1-18.el7, krb5-pkinit 1.15.1-18.el7, krb5-server 1.15.1-18.el7, krb5-server-ldap 1.15.1-18.el7, +1 more
    +1 more products
    Red Hat Enterprise Linux Workstation (v. 7) krb5 1.15.1-18.el7, libkadm5 1.15.1-18.el7, krb5-libs 1.15.1-18.el7, krb5-pkinit 1.15.1-18.el7, krb5-server 1.15.1-18.el7, krb5-server-ldap 1.15.1-18.el7, +1 more
    fixed: vendor fix RHSA-2018:0666
  • Red Hat Enterprise Linux 5 krb5 Red Hat JBoss Enterprise Application Platform 6 krb5 Red Hat JBoss Enterprise Web Server 2 krb5 Red Hat JBoss Enterprise Web Server 3 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

2.40% chance of exploitation in the next 30 days, higher than 84% 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.