MEDIUM
krb5: Invalid S4U2Self or S4U2Proxy request causes assertion failure
Published Aug 9, 2017
6.5
MEDIUMCVSS 3.0
EPSS 2.40%
Description
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.
Affected products
No data.
Configuration 1
OR
- 25
- 26
Configuration 2
OR
- 5-1.13.7
- 1.7
- 1.7.1
- 1.8
- 1.8.1
- 1.8.2
- 1.8.3
- 1.8.4
- 1.8.5
- 1.8.6
- 1.9
- 1.9.1
- 1.9.2
- 1.9.3
- 1.9.4
- 1.10
- 1.10.1
- 1.10.2
- 1.10.3
- 1.10.4
- 1.11
- 1.11.1
- 1.11.2
- 1.11.3
- 1.11.4
- 1.11.5
- 1.12
- 1.12.1
- 1.12.2
- 1.12.3
- 1.13
- 1.13.1
- 1.13.2
- 1.13.3
- 1.13.5
- 1.13.6
- 1.14
- 1.14
- 1.14
- 1.14
- 1.14.1
- 1.14.2
- 1.14.3
- 1.14.4
- 1.14.5
- 1.15
- 1.15.1
- 1.15.1
- 1.15.1
No data.
Red Hat Enterprise Linux 7
krb5-0:1.15.1-18.el7
Fixed · RHSA-2018:0666
Red Hat Enterprise Linux 5
krb5
Not affected
Red Hat Enterprise Linux 6
krb5
Will not fix
Red Hat JBoss Enterprise Application Platform 6
krb5
Not affected
Red Hat JBoss Enterprise Web Server 2
krb5
Not affected
Red Hat JBoss Enterprise Web Server 3
krb5
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | krb5-0:1.15.1-18.el7 | Fixed | RHSA-2018:0666 |
| Red Hat Enterprise Linux 5 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 6 | krb5 | Will not fix | 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 |
| Red Hat JBoss Enterprise Web Server 3 | krb5 | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
6.5 MEDIUM NVD
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
4.0 MEDIUM NVD
AV:N/AC:L/Au:S/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication Single
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
2.40% 0.02397
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
EPSS probability 0.02397
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 (18 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.40% (0.02397) | 83.43th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.40% (0.02397) | 81.78th | v5 (v2026.06.15) |
| Mar 30, 2025 | 0.62% (0.00621) | 67.60th | v4 (v2025.03.14) |
| Mar 29, 2025 | 2.10% (0.02103) | 73.44th | v4 (v2025.03.14) |
| Mar 17, 2025 | 0.62% (0.00621) | 68.28th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.21% (0.00208) | 59.70th | v3 (v2023.03.01) |
| Nov 8, 2023 | 0.21% (0.00208) | 58.56th | v3 (v2023.03.01) |
| May 8, 2023 | 0.22% (0.00222) | 59.01th | v3 (v2023.03.01) |
| Mar 29, 2023 | 0.29% (0.00289) | 64.15th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.34% (0.00344) | 67.03th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00950) | 32.28th | v2 (v2022.01.01) |
| Sep 10, 2022 | 0.95% (0.00950) | 30.63th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00950) | 28.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.95% (0.00950) | 13.46th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.25% (0.01247) | 30.57th | v1 |
| Jan 6, 2022 | 1.25% (0.01247) | 29.93th | v1 |
| Sep 1, 2021 | 1.25% (0.01247) | 68.62th | v1 |
| Apr 14, 2021 | 1.25% (0.01247) | 0.00th | v1 |
Weaknesses (1)
References (9)
- http://www.securityfocus.com/bid/100291 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://access.redhat.com/errata/RHSA-2018:0666 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2017-11368 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1473560 Issue Tracking
- https://github.com/krb5/krb5/commit/ffb35baac6981f9e8914f8f3bffd37f284b85970 x_refsource_CONFIRMPatchThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HNWXM6OQU7G23MG7XWIOBRGP43ECLDT/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBUTXMNZWMVJLQ4NDX5OQFPUVCJRLV3W/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2017-11368
- https://www.cve.org/CVERecord?id=CVE-2017-11368
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/100291 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/errata/RHSA-2018:0666 | vendor-advisoryx_refsource_REDHAT | |
| https://access.redhat.com/security/cve/CVE-2017-11368 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1473560 | Issue Tracking | |
| https://github.com/krb5/krb5/commit/ffb35baac6981f9e8914f8f3bffd37f284b85970 | x_refsource_CONFIRMPatchThird Party Advisory | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4HNWXM6OQU7G23MG7XWIOBRGP43ECLDT/ | vendor-advisoryx_refsource_FEDORA | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UBUTXMNZWMVJLQ4NDX5OQFPUVCJRLV3W/ | vendor-advisoryx_refsource_FEDORA | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-11368 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-11368 |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Aug 9, 2017
Updated Aug 5, 2024
Reserved Jul 17, 2017
Link CVE-2017-11368
CISA Vulnrichment
Updated n/a