krb5: KDC denial of service vulnerabilities (MITKRB5-SA-2011-006)
Published Oct 20, 2011
7.8
HIGHCVSS 2.0
EPSS 4.05%
Description
The lookup_lockout_policy function in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.8 through 1.8.4 and 1.9 through 1.9.1, when the db2 (aka Berkeley DB) or LDAP back end is used, allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via vectors that trigger certain process_as_req errors.
Affected products
No data.
- 1.8
- 1.8.1
- 1.8.2
- 1.8.3
- 1.8.4
- 1.9
- 1.9.1
No data.
Red Hat Enterprise Linux 6
krb5-0:1.9-9.el6_1.2
Fixed · RHSA-2011:1379
Red Hat Enterprise Linux 4
krb5
Not affected
Red Hat Enterprise Linux 5
krb5
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | krb5-0:1.9-9.el6_1.2 | Fixed | RHSA-2011:1379 |
| Red Hat Enterprise Linux 4 | krb5 | Not affected | n/a |
| Red Hat Enterprise Linux 5 | krb5 | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of krb5 as shipped with Red Hat Enterprise Linux 4 or 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:N/A:C
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
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- 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 | 4.05% (0.04046) | 90.31th | v5 (v2026.06.15) |
| Jun 15, 2026 | 4.05% (0.04046) | 89.27th | v5 (v2026.06.15) |
| Mar 2, 2026 | 2.38% (0.02376) | 84.76th | v4 (v2025.03.14) |
| Dec 14, 2025 | 5.57% (0.05570) | 89.96th | v4 (v2025.03.14) |
| Nov 9, 2025 | 4.24% (0.04237) | 88.25th | v4 (v2025.03.14) |
| Mar 30, 2025 | 2.77% (0.02768) | 84.76th | v4 (v2025.03.14) |
| Mar 29, 2025 | 4.99% (0.04989) | 82.46th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.77% (0.02768) | 85.08th | v4 (v2025.03.14) |
| Dec 17, 2024 | 50.21% (0.50210) | 97.61th | v3 (v2023.03.01) |
| Nov 5, 2024 | 69.12% (0.69115) | 98.08th | v3 (v2023.03.01) |
| Mar 7, 2023 | 73.76% (0.73762) | 97.52th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.32% (0.01319) | 71.27th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.32% (0.01319) | 71.23th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.32% (0.01319) | 69.22th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.32% (0.01319) | 44.98th | v2 (v2022.01.01) |
References (10)
- http://lists.opensuse.org/opensuse-security-announce/2011-10/msg00009.html vendor-advisoryx_refsource_SUSE
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt x_refsource_CONFIRMVendor Advisory
- http://www.kb.cert.org/vuls/id/659251 third-party-advisoryx_refsource_CERT-VNUS Government Resource
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:159 vendor-advisoryx_refsource_MANDRIVA
- http://www.mandriva.com/security/advisories?name=MDVSA-2011:160 vendor-advisoryx_refsource_MANDRIVA
- http://www.redhat.com/support/errata/RHSA-2011-1379.html vendor-advisoryx_refsource_REDHATVendor Advisory
- https://access.redhat.com/security/cve/CVE-2011-1529 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=737711 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2011-1529
- https://www.cve.org/CVERecord?id=CVE-2011-1529
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2011-10/msg00009.html | vendor-advisoryx_refsource_SUSE | |
| http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2011-006.txt | x_refsource_CONFIRMVendor Advisory | |
| http://www.kb.cert.org/vuls/id/659251 | third-party-advisoryx_refsource_CERT-VNUS Government Resource | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2011:159 | vendor-advisoryx_refsource_MANDRIVA | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2011:160 | vendor-advisoryx_refsource_MANDRIVA | |
| http://www.redhat.com/support/errata/RHSA-2011-1379.html | vendor-advisoryx_refsource_REDHATVendor Advisory | |
| https://access.redhat.com/security/cve/CVE-2011-1529 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=737711 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-1529 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-1529 |
Change history (0)
No recorded changes yet.