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Vulnerability details: VCID-r2r9-z6dp-2ycz
Vulnerability ID VCID-r2r9-z6dp-2ycz
Aliases CVE-2020-14359
GHSA-jh6m-3pqw-242h
Summary Keycloak Gatekeeper vulnerable to bypass on using lower case HTTP headers A vulnerability was found in all versions of the deprecated package Keycloak Gatekeeper, where on using lower case HTTP headers (via cURL) we can bypass our Gatekeeper. Lower case headers are also accepted by some webservers (e.g. Jetty). This means there is no protection when we put a Gatekeeper in front of a Jetty server and use lowercase headers.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-305 Authentication Bypass by Primary Weakness
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 7.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14359.json
epss 0.00259 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
epss 0.00328 https://api.first.org/data/v1/epss?cve=CVE-2020-14359
cvssv3.1 7.3 https://bugzilla.redhat.com/show_bug.cgi?id=1868591
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=1868591
cvssv3.1 7.3 https://github.com/keycloak/keycloak-gatekeeper
generic_textual HIGH https://github.com/keycloak/keycloak-gatekeeper
cvssv3.1 7.3 https://github.com/keycloak/keycloak/issues/12934
generic_textual HIGH https://github.com/keycloak/keycloak/issues/12934
cvssv3.1 7.3 https://issues.jboss.org/browse/KEYCLOAK-14090
generic_textual HIGH https://issues.jboss.org/browse/KEYCLOAK-14090
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2020-14359
cvssv3.1 7.3 https://nvd.nist.gov/vuln/detail/CVE-2020-14359
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-14359
archlinux High https://security.archlinux.org/AVG-1332
cvssv3.1 7.3 https://web.archive.org/web/20190613000352/github.com/keycloak/keycloak-gatekeeper
generic_textual HIGH https://web.archive.org/web/20190613000352/github.com/keycloak/keycloak-gatekeeper
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14359.json
https://api.first.org/data/v1/epss?cve=CVE-2020-14359
https://bugzilla.redhat.com/show_bug.cgi?id=1868591
https://github.com/keycloak/keycloak-gatekeeper
https://github.com/keycloak/keycloak/issues/12934
https://issues.jboss.org/browse/KEYCLOAK-14090
https://nvd.nist.gov/vuln/detail/CVE-2020-14359
https://web.archive.org/web/20190613000352/github.com/keycloak/keycloak-gatekeeper
AVG-1332 https://security.archlinux.org/AVG-1332
cpe:2.3:a:redhat:louketo_proxy:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:louketo_proxy:*:*:*:*:*:*:*:*
GHSA-jh6m-3pqw-242h https://github.com/advisories/GHSA-jh6m-3pqw-242h
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-14359.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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://bugzilla.redhat.com/show_bug.cgi?id=1868591
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://github.com/keycloak/keycloak-gatekeeper
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://github.com/keycloak/keycloak/issues/12934
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://issues.jboss.org/browse/KEYCLOAK-14090
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:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14359
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:N/UI:N/S:U/C:L/I:L/A:L Found at https://nvd.nist.gov/vuln/detail/CVE-2020-14359
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L Found at https://web.archive.org/web/20190613000352/github.com/keycloak/keycloak-gatekeeper
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 0.49035
EPSS Score 0.00259
Published At Aug. 17, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:02:52.404983+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-jh6m-3pqw-242h/GHSA-jh6m-3pqw-242h.json 37.0.0