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Vulnerability details: VCID-r6sd-68sa-33e5
Vulnerability ID VCID-r6sd-68sa-33e5
Aliases CVE-2020-1727
Summary A vulnerability was found in Keycloak before 9.0.2, where every Authorization URL that points to an IDP server lacks proper input validation as it allows a wide range of characters. This flaw allows a malicious to craft deep links that introduce further attack scenarios on affected clients.
Status Published
Exploitability 0.5
Weighted Severity 5.8
Risk 2.9
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-20 Improper Input Validation
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 6.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1727.json
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
epss 0.00184 https://api.first.org/data/v1/epss?cve=CVE-2020-1727
cvssv2 5.5 https://nvd.nist.gov/vuln/detail/CVE-2020-1727
cvssv3.1 5.4 https://nvd.nist.gov/vuln/detail/CVE-2020-1727
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1727.json
https://api.first.org/data/v1/epss?cve=CVE-2020-1727
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1727
1800573 https://bugzilla.redhat.com/show_bug.cgi?id=1800573
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
CVE-2020-1727 https://nvd.nist.gov/vuln/detail/CVE-2020-1727
RHSA-2020:2252 https://access.redhat.com/errata/RHSA-2020:2252
RHSA-2020:2905 https://access.redhat.com/errata/RHSA-2020:2905
RHSA-2020:5625 https://access.redhat.com/errata/RHSA-2020:5625
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1727.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: AV:N/AC:L/Au:S/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-1727
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:L/PR:L/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-1727
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 0.40569
EPSS Score 0.00184
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T10:10:20.754196+00:00 NVD Importer Import https://nvd.nist.gov/vuln/detail/CVE-2020-1727 37.0.0