krb5: null pointer deference in strlen function in plugins/kdb/ldap/libkdb_ldap/ldap_principal2.c
Published Jan 16, 2018
6.5
MEDIUMCVSS 3.0
EPSS 1.80%
Description
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
krb5
Not affected
Red Hat Enterprise Linux 6
krb5
Not affected
Red Hat Enterprise Linux 7
krb5
Not affected
Red Hat Enterprise Linux 8
krb5
Not affected
Red Hat JBoss Core Services
krb5
Not affected
Red Hat JBoss Enterprise Application Platform 6
krb5
Not affected
Red Hat JBoss Enterprise Web Server 2
krb5
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 6 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 8 | krb5 | Not affected | n/a |
| Red Hat JBoss Core Services | krb5 | Not affected | n/a |
| Red Hat JBoss Enterprise Application Platform 6 | krb5 | Not affected | n/a |
| Red Hat JBoss Enterprise Web Server 2 | krb5 | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw was found to be a duplicate of CVE-2018-5729. Please see https://access.redhat.com/security/cve/CVE-2018-5729 for information about affected products and security errata.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.80% (0.01795) | 77.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.83% (0.01829) | 75.99th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.78% (0.00783) | 71.50th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.69% (0.02692) | 76.40th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.16% (0.00157) | 52.53th | v3 (v2023.03.01) |
| Nov 26, 2023 | 0.16% (0.00157) | 52.09th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.15% (0.00149) | 49.17th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.05% (0.01055) | 27.52th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.65% (0.00651) | 18.22th | v1 |
| Jan 6, 2022 | 0.65% (0.00651) | 17.65th | v1 |
| Sep 1, 2021 | 0.65% (0.00651) | 45.91th | v1 |
| Apr 14, 2021 | 0.65% (0.00651) | 0.00th | v1 |
References (5)
- https://access.redhat.com/security/cve/CVE-2018-5710 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1535575 Issue Tracking
- https://github.com/poojamnit/Kerberos-V5-1.16-Vulnerabilities/tree/master/Denial%20Of%20Service%28DoS%29 x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2018-5710
- https://www.cve.org/CVERecord?id=CVE-2018-5710
Change history (0)
No recorded changes yet.