Medium severity6.6NVD Advisory· Published Nov 11, 2020· Updated Jun 17, 2026
CVE-2020-17049
CVE-2020-17049
Description
A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
44- cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23409:*:*:*:*:*:x64:*Range: 6.2.0
- cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4530:*:*:*:*:*:*:*Range: 10.0.0
- cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2061:*:*:*:*:*:*:*Range: 10.0.0
- osv-coords40 versionspkg:rpm/almalinux/bind-dyndb-ldappkg:rpm/almalinux/custodiapkg:rpm/almalinux/ipa-clientpkg:rpm/almalinux/ipa-client-commonpkg:rpm/almalinux/ipa-client-epnpkg:rpm/almalinux/ipa-client-sambapkg:rpm/almalinux/ipa-commonpkg:rpm/almalinux/ipa-healthcheckpkg:rpm/almalinux/ipa-healthcheck-corepkg:rpm/almalinux/ipa-python-compatpkg:rpm/almalinux/ipa-selinuxpkg:rpm/almalinux/ipa-serverpkg:rpm/almalinux/ipa-server-commonpkg:rpm/almalinux/ipa-server-dnspkg:rpm/almalinux/ipa-server-trust-adpkg:rpm/almalinux/krb5-develpkg:rpm/almalinux/krb5-libspkg:rpm/almalinux/krb5-pkinitpkg:rpm/almalinux/krb5-serverpkg:rpm/almalinux/krb5-server-ldappkg:rpm/almalinux/krb5-workstationpkg:rpm/almalinux/libkadm5pkg:rpm/almalinux/opendnssecpkg:rpm/almalinux/python3-custodiapkg:rpm/almalinux/python3-ipaclientpkg:rpm/almalinux/python3-ipalibpkg:rpm/almalinux/python3-ipaserverpkg:rpm/almalinux/python3-ipatestspkg:rpm/almalinux/python3-jwcryptopkg:rpm/almalinux/python3-kdcproxypkg:rpm/almalinux/python3-pyusbpkg:rpm/almalinux/python3-qrcodepkg:rpm/almalinux/python3-qrcode-corepkg:rpm/almalinux/python3-yubicopkg:rpm/almalinux/slapi-nispkg:rpm/almalinux/softhsmpkg:rpm/almalinux/softhsm-develpkg:rpm/opensuse/samba&distro=openSUSE%20Tumbleweedpkg:rpm/suse/ldb&distro=SUSE%20Enterprise%20Storage%207pkg:rpm/suse/samba&distro=SUSE%20Enterprise%20Storage%207
< 11.6-4.module_el8.6.0+3339+9b5fdd22+ 39 more
- (no CPE)range: < 11.6-4.module_el8.6.0+3339+9b5fdd22
- (no CPE)range: < 0.6.0-3.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 0.12-3.module_el8.9.0+3651+d05ea4c5
- (no CPE)range: < 0.12-3.module_el8.9.0+3651+d05ea4c5
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 1.20.1-8.el9
- (no CPE)range: < 2.1.7-1.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 0.6.0-3.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 4.9.12-11.module_el8.9.0+3715+e4197dc9.alma.1
- (no CPE)range: < 0.5.0-1.1.module_el8.7.0+3349+cfeff52e
- (no CPE)range: < 0.4-5.module_el8.9.0+3682+f63caf3e
- (no CPE)range: < 1.0.0-9.1.module_el8.7.0+3349+cfeff52e
- (no CPE)range: < 5.1-12.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 5.1-12.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 1.3.2-9.1.module_el8.7.0+3349+cfeff52e
- (no CPE)range: < 0.60.0-4.module_el8.9.0+3682+f63caf3e.alma.1
- (no CPE)range: < 2.6.0-5.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 2.6.0-5.module_el8.6.0+2881+2f24dc92
- (no CPE)range: < 4.15.2+git.193.a4d6307f1fd-1.1
- (no CPE)range: < 2.2.2-4.6.1
- (no CPE)range: < 4.13.13+git.545.5897c2d94f3-3.12.1
Patches
Vulnerability mechanics
References
3- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049nvdPatchVendor Advisory
- www.openwall.com/lists/oss-security/2021/11/10/3nvdMailing ListThird Party Advisory
- security.gentoo.org/glsa/202309-06nvd
News mentions
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