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Vulnerability details: VCID-wrs3-g5e3-8kbu
Vulnerability ID VCID-wrs3-g5e3-8kbu
Aliases CVE-2018-20217
Summary A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-617 Reachable Assertion
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20217.json
epss 0.00883 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.00883 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
epss 0.01616 https://api.first.org/data/v1/epss?cve=CVE-2018-20217
cvssv3 6.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 3.5 https://nvd.nist.gov/vuln/detail/CVE-2018-20217
cvssv3.1 5.3 https://nvd.nist.gov/vuln/detail/CVE-2018-20217
Reference id Reference type URL
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20217.json
https://api.first.org/data/v1/epss?cve=CVE-2018-20217
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20217
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
https://security.netapp.com/advisory/ntap-20190416-0006/
1665296 https://bugzilla.redhat.com/show_bug.cgi?id=1665296
917387 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=917387
cpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2018-20217 https://nvd.nist.gov/vuln/detail/CVE-2018-20217
USN-5828-1 https://usn.ubuntu.com/5828-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2018-20217.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:S/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20217
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2018-20217
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.74452
EPSS Score 0.00883
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:33:01.426914+00:00 Alpine Linux Importer Import https://secdb.alpinelinux.org/v3.12/main.json 37.0.0