krb5: KDC may issue unrequested tickets due to KrbFastReq forgery (MITKRB5-SA-2010-007)
Published Dec 2, 2010
2.1
LOWCVSS 2.0
EPSS 2.09%
Description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."
Affected products
No data.
- 1.7
No data.
No Red Hat product state for this CVE.
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, 5, or 6.
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:H/Au:S/C:N/I:P/A:N
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 3, 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 (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.09% (0.02089) | 80.94th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.09% (0.02089) | 79.10th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.48% (0.00483) | 63.15th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.31% (0.00309) | 70.81th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.40% (0.00397) | 72.81th | v3 (v2023.03.01) |
| Jul 23, 2023 | 0.40% (0.00397) | 70.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.31% (0.00309) | 65.20th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.19% (0.02186) | 80.97th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.19% (0.02186) | 79.16th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.19% (0.02186) | 57.93th | v2 (v2022.01.01) |
References (21)
- http://kb.vmware.com/kb/1035108 x_refsource_CONFIRM
- http://lists.apple.com/archives/security-announce/2011/Mar/msg00006.html vendor-advisoryx_refsource_APPLE
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00000.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html vendor-advisoryx_refsource_SUSE
- http://lists.vmware.com/pipermail/security-announce/2011/000133.html mailing-listx_refsource_MLIST
- http://osvdb.org/69607 vdb-entryx_refsource_OSVDB
- http://support.apple.com/kb/HT4581 x_refsource_CONFIRM
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt x_refsource_CONFIRMVendor Advisory
- http://www.mandriva.com/security/advisories?name=MDVSA-2010:246 vendor-advisoryx_refsource_MANDRIVA
- http://www.securityfocus.com/archive/1/514953/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/archive/1/517739/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/45122 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1024803 vdb-entryx_refsource_SECTRACK
- http://www.ubuntu.com/usn/USN-1030-1 vendor-advisoryx_refsource_UBUNTU
- http://www.vmware.com/security/advisories/VMSA-2011-0007.html x_refsource_CONFIRM
- http://www.vupen.com/english/advisories/2010/3094 vdb-entryx_refsource_VUPEN
- http://www.vupen.com/english/advisories/2010/3118 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2010-4021 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=648736 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2010-4021
- https://www.cve.org/CVERecord?id=CVE-2010-4021
Change history (0)
No recorded changes yet.