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Vulnerability details: VCID-f7ys-kjgb-nyg5
Vulnerability ID VCID-f7ys-kjgb-nyg5
Aliases CVE-2020-1758
GHSA-c597-f74m-jgc2
Summary Improper Certificate Validation and Improper Validation of Certificate with Host Mismatch in Keycloak A flaw was found in Keycloak in versions before 10.0.0, where it does not perform the TLS hostname verification while sending emails using the SMTP server. This flaw allows an attacker to perform a man-in-the-middle (MITM) attack.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-295 Improper Certificate Validation
CWE-297 Improper Validation of Certificate with Host Mismatch
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 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1758.json
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
epss 0.00254 https://api.first.org/data/v1/epss?cve=CVE-2020-1758
cvssv3.1 5.9 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1758
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1758
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-c597-f74m-jgc2
cvssv3.1 5.9 https://issues.redhat.com/browse/KEYCLOAK-13285
generic_textual MODERATE https://issues.redhat.com/browse/KEYCLOAK-13285
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-1758
cvssv3.1 5.9 https://nvd.nist.gov/vuln/detail/CVE-2020-1758
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-1758
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1758.json
https://api.first.org/data/v1/epss?cve=CVE-2020-1758
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1758
https://issues.redhat.com/browse/KEYCLOAK-13285
https://nvd.nist.gov/vuln/detail/CVE-2020-1758
1812514 https://bugzilla.redhat.com/show_bug.cgi?id=1812514
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:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:openstack:10:*:*:*:*:*:*:*
GHSA-c597-f74m-jgc2 https://github.com/advisories/GHSA-c597-f74m-jgc2
RHSA-2020:2106 https://access.redhat.com/errata/RHSA-2020:2106
RHSA-2020:2107 https://access.redhat.com/errata/RHSA-2020:2107
RHSA-2020:2108 https://access.redhat.com/errata/RHSA-2020:2108
RHSA-2020:2112 https://access.redhat.com/errata/RHSA-2020:2112
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-1758.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:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-1758
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:H/PR:N/UI:N/S:U/C:H/I:N/A:N Found at https://issues.redhat.com/browse/KEYCLOAK-13285
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:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-1758
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:N/UI:N/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-1758
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 0.48671
EPSS Score 0.00254
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:02:16.525712+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/02/GHSA-c597-f74m-jgc2/GHSA-c597-f74m-jgc2.json 37.0.0