CVE-2018-20217

lowpriority · track · 21EPSS 0.014 · 73 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.42% (73rd) EPSS

CVSS 3.5 · low

Is it mine?

9 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 3.5–5.3

v2.03.5lowAV:N/AC:M/Au:S/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 6.8 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 1.6 · impact 3.6

v3.15.3mediumAV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.14.9mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-617USprimaryCWE-617US

affected products (9)

Products and version ranges known to be affected.

IBM Security Verify Access 10.0.0all versionscert_bundDEcpe:/a:ibm:security_verify_access:10.0.0
IBM Security Verify Access 10.0.0.0 - 10.0.6.1all versionscert_bundDEcpe:/a:ibm:security_verify_access:10.0.0.0_-_10.0.6.1
IBM Security Verify Access Docker 10.0.0all versionscert_bundDEcpe:/a:ibm:security_verify_access:docker_container__10.0.2.0
n/a n/a≤ n/aenisa_euvdEU
MIT Kerberos≤ 1.17fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Common Edition≤ 1.6 «Смоленск»fstec_bduRU
debian debian linux= 8.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
mit kerberos< 5-1.17nvdUScpe:2.3:a:mit:kerberos:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2022-0602IBM Security Verify Access: Mehrere SchwachstellenDeutsch2022-07-06csaf · cert_bundDE
Ein entfernter anonymer, authentisierter oder lokaler Angreifer oder ein Angreifer aus dem angrenzenden Netzwerk kann mehrere Schwachstellen in IBM Security Verify Access ausnutzen, um einen Cross-Site-Scripting-Angriff durchzuführen, vertrauliche Informationen offenzulegen, seine Privilegien zu erweitern, Informationen zu manipulieren, einen Denial-of-Service-Zustand zu verursachen und Sicherheitsmaßnahmen zu umgehen.
WID-SEC-W-2023-0199MIT Kerberos: Schwachstelle ermöglicht Denial of ServiceDeutsch2019-01-07csaf · cert_bundDE
Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in MIT Kerberos ausnutzen, um einen Denial of Service Angriff durchzuführen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund nvd NVD CVE.org MITRE

published 2018-12-26modified 2026-06-17

related (1,031)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2015-5477US	high7.8OT critical	99.6% (100th)	KEV	2015-07-29
named in ISC BIND 9.x before 9.9.7-P2 and 9.10.x before 9.10.2-P3 allows remote attackers to cause a denial of service (REQUIRE assertion failure and daemon exit) via TKEY queries.
CVE-2016-2776US	high7.5	89.5% (100th)	Exploit	2016-09-28
buffer.c in named in ISC BIND 9 before 9.9.9-P3, 9.10.x before 9.10.4-P3, and 9.11.x before 9.11.0rc3 does not properly construct responses, which allows remote attackers to cause…
CVE-2021-25216US	critical9.8	83.0% (100th)	—	2021-04-29
In BIND 9.5.0 -> 9.11.29, 9.12.0 -> 9.16.13, and versions BIND 9.11.3-S1 -> 9.11.29-S1 and 9.16.8-S1 -> 9.16.13-S1 of BIND Supported Preview Edition, as well as release versions 9.…
CVE-2020-8617US	medium5.9	93.4% (100th)	Exploit	2020-05-19
Using a specially-crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG…
CVE-2018-5740US	high7.5	59.6% (99th)	Exploit	2019-01-16
"deny-answer-aliases" is a little-used feature intended to help recursive server operators protect end users against DNS rebinding attacks, a potential method of circumventing the…

+1026 more

references (24)

External citations — patches, advisories, analysis.

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