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CVE-2018-5710

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. The pre-defined function ...

6.5 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.80%Up 1.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

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.

Record
CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2018-5710
Updated
2026-11-02
EUVDEUVD-2018-17479 No score

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.

Record
EUVD-2018-17479
Updated
2026-11-03
GitHub AdvisoriesGHSA-6wfw-m2q3-x7rq 6.5

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. The pre-defined function ...

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.

Record
GHSA-6wfw-m2q3-x7rq
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSVALPINE-CVE-2018-5710 6.5

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.

Record
ALPINE-CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBELL-CVE-2018-5710 6.5

CVE-2018-5710 does not affect BellSoft software

Record
BELL-CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 4 moreShow less
OSV 6.5

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.

Record
CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-5710 6.5

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.

Record
DEBIAN-CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2018-5710 6.5

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.

Record
UBUNTU-CVE-2018-5710
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2018-0155 No score

Updated krb5 packages fix security vulnerabilities

Updated krb5 packages fix security vulnerabilities:

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 (CVE-2018-5710, CVE-2018-5729, CVE-2018-5730).

Record
MGASA-2018-0155
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
krb5
Alpine:v3.10
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.11
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.12
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.13
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.14
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.15
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.16
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.17
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.18
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.19
 before 1.15.3-r0
1.15.3-r0
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Affected packages
PackageAffectedFixed
krb5
Alpine:v3.20
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.21
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.22
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.23
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.24
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.7
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.8
 before 1.15.3-r0
1.15.3-r0
krb5
Alpine:v3.9
 before 1.15.3-r0
1.15.3-r0
krb5
Debian:12
 before 1.16.1-1
1.16.1-1
krb5
Debian:13
 before 1.16.1-1
1.16.1-1
krb5
Debian:14
 before 1.16.1-1
1.16.1-1
krb5
Debian:8
 before 1.12.1+dfsg-19+deb8u5, plus listed versions
1.12.1+dfsg-191.12.1+dfsg-19+deb8u11.12.1+dfsg-19+deb8u21.12.1+dfsg-19+deb8u4
1.12.1+dfsg-19+deb8u5
krb5
Debian:9
 before 1.15-1+deb9u3, plus listed versions
1.15-11.15-1+deb9u11.15-1+deb9u2
1.15-1+deb9u3
krb5
Mageia:6
 before 1.15.1-2.3.mga6
1.15.1-2.3.mga6
krb5
Ubuntu:14.04:LTS
 before 1.12+dfsg-2ubuntu5.4, plus listed versions
1.10.1+dfsg-6.1ubuntu11.11.3+dfsg-3ubuntu21.12+dfsg-2ubuntu11.12+dfsg-2ubuntu21.12+dfsg-2ubuntu3
Show 6 moreShow less
1.12+dfsg-2ubuntu41.12+dfsg-2ubuntu4.21.12+dfsg-2ubuntu51.12+dfsg-2ubuntu5.11.12+dfsg-2ubuntu5.21.12+dfsg-2ubuntu5.3
1.12+dfsg-2ubuntu5.4
krb5
Ubuntu:16.04:LTS
 before 1.13.2+dfsg-5ubuntu2.1, plus listed versions
1.13.2+dfsg-21.13.2+dfsg-31.13.2+dfsg-41.13.2+dfsg-51.13.2+dfsg-5ubuntu11.13.2+dfsg-5ubuntu2
1.13.2+dfsg-5ubuntu2.1
krb5
Ubuntu:18.04:LTS
 before 1.16-2ubuntu0.1, plus listed versions
1.15.1-21.16-21.16-2build1
1.16-2ubuntu0.1

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-5710 is a medium vulnerability (CVSS 6.5) in Mit Kerberos, published January 16, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.80%, the 78th percentile. Fixed in krb5 1.15.3-r0.

References

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