// For flags

CVE-2020-1758

keycloak: improper verification of certificate with host mismatch could result in information disclosure

Severity Score

5.9
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Se encontró un fallo en Keycloak en versiones anteriores a 10.0.0, donde no se lleva a cabo una verificación del nombre de host TLS mientras se envía correos electrónicos utilizando el servidor SMTP. Este fallo permite a un atacante llevar a cabo un ataque de tipo man-in-the-middle (MITM).

A flaw was found in Keycloak, 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.

Red Hat Single Sign-On 7.3 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This release of Red Hat Single Sign-On 7.3.8 serves as a replacement for Red Hat Single Sign-On 7.3.7, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References. Issues addressed include bypass, cross site scripting, information leakage, and remote SQL injection vulnerabilities.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2019-11-27 CVE Reserved
  • 2020-05-12 CVE Published
  • 2024-08-04 CVE Updated
  • 2025-04-15 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-295: Improper Certificate Validation
  • CWE-297: Improper Validation of Certificate with Host Mismatch
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Redhat
Search vendor "Redhat"
 Keycloak
Search vendor "Redhat" for product "Keycloak"
 < 10.0.0
Search vendor "Redhat" for product "Keycloak" and version " < 10.0.0"
-
Affected
Redhat
Search vendor "Redhat"
 Openstack
Search vendor "Redhat" for product "Openstack"
 10
Search vendor "Redhat" for product "Openstack" and version "10"
-
Affected